Re: 1969 Custom/10 clean up
 

The benefit is that you have a bit of pressure in the brakeline and brakecilinders, which gives faster responce on your brakepedal.
You can get these valves in different pressure values.

I had a '67 Volvo Amazon once with bad brakes, put in residual valves in the front and rear brakelines, and that made a huge different, just a thought...

Re: 1969 Custom/10 clean up
 

Ok, I never heard of it, but this is a good tip! I'll see if I can find them somewhere. it doesn't hurt to try

Re: 1969 Custom/10 clean up
 

I was staring at my truck having a beer and a smoke when I had an epiphany.. could the brake linkage system cause the problem?

so the new MBC and BB came without the support frame. I luckily was able to purchase one from a member of this forum.
but instead of the pushrod going from the pedal directly in to the booster, there is a linkage system. ( see pics) how likely is it, that this diminishes the power I apply to the pedal to what eventually goes into the MBC?
http://www.mijnalbum.nl/Foto360-FFLUB3AB.jpg
http://www.mijnalbum.nl/Foto360-V3VCQNH7.jpg

further more I looked at the size of the booster and thought it was pretty big..(compared to European cars yes) but I have these two old MDC and BB's which I didn't use, because I bought the new one and looking at those, there is a significant size difference..not so much in diameter, but more in the depth.. the new one from bracket to mbc is 4" thick and the old one is almost 6" thick...that's, substantial!
http://www.mijnalbum.nl/Foto360-RNSOIS7V.jpg
http://www.mijnalbum.nl/Foto360-7L6Z3DHK.jpg

Re: 1969 Custom/10 clean up
 

The linkage increases the movement of the push rod into the booster/master cylinder. If the rod from the pedal pushes in 1/4" the rod into the M/C is about twice that. Mine has the same set up. It looks like the booster on the truck is a standard C-10 unit and the ones in the box are the C-20 units.

Did you get the rod from the power brake set up that connects to the brake pedal? They are different lengths. The non-power brake rod from the pedal is shorter and won't work on a power brake set up. The rod into the booster may also be different between the C-10 and C-20 booster styles but I'm not sure on that.

Have you measured how much vacuum you have? It should be a good 15" or more at idle. Mine will run about 10-12" while driving and increase at idle. Drops to almost nothing when accelerating. Measure it at the vacuum line to the booster.

If the brakes and master cylinder are properly bled (not always easy, I did mine multiple times) and the brakes properly adjusted the brakes should be firm. If you have too much pedal movement before you feel pressure then the rod connected to the brake pedal needs adjusted.

When I converted to power brakes I had to learn how to brake again because they grabbed so much harder and quicker than I was used to. I used the C-20 booster set up.

Re: 1969 Custom/10 clean up
 

Thanks for the great info HG,

from the booster to the bracket we used the rod that came with the mc/booster. from the bracket to the brake pedal I made one my self, because the default one wasn't long enough.

No I haven't, that's a good tip. I can use a standard vacuum gauge for that right? someone also told me how to test the booster. with the engine running, pinch the vacuum line between the booster and intake manifold. if the engine starts to ref lower than the booster is leaking.

the pedal travel feels good, but indeed I need to bleed them again because on the first stomp on the pedal is is soggy and then firms up if I pump the brake.

OMG...I'd give my left arm now for grabby brakes. :)

Re: 1969 Custom/10 clean up
 

yesterday I went over the brakes again, re adjusted the rear to make them tighter and took apart the front brakes to see if anything was seized up.

after putting everything back together I had a friend helping me bleed the brakes the old way, by stomping on the pedal. I know thats not the way, but we where careful not to let the brake pedal go to the floor, thus damaging the cups.
then we took it out for a test drive.
Seeing I don't have MOT, nor doors..I can't take it for a 20mile drive, so it was just 2 circles around the block, but I did manage to get the right rear wheel to lock up! so there is some progress :).

now seeing the rear wheel locking up, perhaps I should change the plumbing on the master cylinder again? (now the most forward chamber goes to the rear and the backward chamber goes to the front)

Re: 1969 Custom/10 clean up
 

Today I visited a client who was just around the conrner of a renowned USA garage in the south of Holland (Blazerparts.nl) . So I popped in and had a chat with the owner about my brake problem.
to him my problem has a simple solution; use the master brake cylinder and booster which came with the front end...:waah:
he says the new set I have is for a Nova or something small, but not for a big 'ol truck

as a trip down to memory lane, or back to page 1 of this thread, you can see I got a MBC and Booster with the complete crossmember..
I'll be installing it on Friday and hope it works as promised.

here the pictures of the set as I picked it up....5(!!) years ago?? OMG..it's about time to be driving it right :)
http://www.mijnalbum.nl/Foto-Z3DLU7LC.jpg

http://www.mijnalbum.nl/Foto-AKFF3NZA.jpg

Re: 1969 Custom/10 clean up
 

Today I started my conversion to the other master brake cilinder and booster.
took of the old one
http://www.mijnalbum.nl/Foto360-FCDTW8IK.jpg

then test fitted the other one, because I had to adapt the bracket to fit the mount points
http://www.mijnalbum.nl/Foto360-FSRUZJLU.jpg

then I cleaned it ang gave it a fresh coat of paint..that'll have to dry, so mounting it will be Friday.
http://www.mijnalbum.nl/Foto360-NOSFZQCB.jpg

ofcourse I'm left with one question: the biggest chamber is for the rear brakes and the small one for the front?
http://www.mijnalbum.nl/Foto540-JRWKWZXM.jpg

Re: 1969 Custom/10 clean up
 

here the other MBC and booster mounted:
http://www.mijnalbum.nl/Foto360-36YZJBGB.jpg

But.... @#$^@# a list of strong curse words, swaering and other profanities

No pressure, what so ever..we bled the brakes with vacuum extensively, nothing, zip, nada, zilch, zero..the master brake cilinder is broken, kaput, end of life.

luckily a referbished one only costs about $70,- so I'll pick one up during the week, but I was ready for some good instead of bad :whine:

Re: 1969 Custom/10 clean up
 

You can't have all the luck, Steve.
Trust me, I know!

In the end it all comes your way ;)

Re: 1969 Custom/10 clean up
 

How about some murphy's law?

Yesterday I desided to take off the MBC, because today I would be picking up the refurbished one.
no comments needed, just look at the picture
http://www.mijnalbum.nl/Foto360-UQHHJTAD.jpg
yes the freaking stub snapped!!! and I wasn't even applying real power to it.

But..luckily, I have exactly the same booster laying around and to be honoust it even looked a bit better. so I test fitted and gues who stuck his ugly head around the corner? yeah... Murphy.
the pin that goes from the booster to the pedal is over an inch shorter :(
http://www.mijnalbum.nl/foto360-TLRJXYV6.jpg

ow well...something to do tomorrow night I guess

Re: 1969 Custom/10 clean up
 

Last night my mate and I headed to the garage in good spirit
first we made a new brake pedal rod (don't know if thats how you call it) from two other ones
http://www.mijnalbum.nl/Foto360-OINLEHFY.jpg

http://www.mijnalbum.nl/Foto360-ACXRT3TY.jpg

http://www.mijnalbum.nl/Foto360-SAZHAN7F.jpg

and the result:
http://www.mijnalbum.nl/Foto360-BVSS8ZK8.jpg

Booster mounted, referbished master brake cilinder mounted, brake lines connected and brakes bleeded..
Hey!! And Murphy is back, no pressure...WTF!!
So, another round of bleeding without any result :(
Then we bled the brakes manually, being extra careful not to press the pedal to deep, but no brake pressure. Erghllll ok, so then we re-adjusted the rear brakes, just to be sure. when moving the brake pedal, we could see the brake cilinders work in the back aswel the calipers in the front, but the pedal has to travel sooo deep and will continiue to sink. (yes with the drums back on)

against all logic we desided to take her out for a spin around the block, considering it was 1am, nothing much could go wrong because I still have the park brake which works fine. But as suspected, no improvement. she will stop, but it takes a while and also pumping the brake pedal doesn't improve the braking.

assuming that the factory referbished master brake cilinder is good, there should be air in the system..but where??? We pumped close to half a gallon of brake fluid thrue the systemm
I'm so sick right now..

Re: 1969 Custom/10 clean up
 

back to the brake story..
I now bench bleeded the master brake cilinder and that actually did give some progress
http://www.mijnalbum.nl/Foto360-EGOBJD4Q.jpg
now I ordered some new rear brake drums and I'll pick them up next thursday, untill then I'm not messing with the brakes..just letting it rest so to say :)

I then turned to another problem and that is that the thread on the steering shaft was completely shot, so I went over to my neighbor who has a lathe
http://www.mijnalbum.nl/Foto360-CR6XXDCK.jpg
turned out good!
http://www.mijnalbum.nl/Foto360-Z6BLS6KD.jpg

Re: 1969 Custom/10 clean up
 

Hey Steve, hope you get your brakes done this time!!

Nice to have a lathe, they come in very handy some time ;)

Re: 1969 Custom/10 clean up
 

How are the brake hoses? Any bulges in the rubber?

Re: 1969 Custom/10 clean up
 

The brake hoses are all new as are the brake lines, so no proboems there.

today I drove 125 Miles for nothing..the shop which ordered my brake drums didn't get them in on time..guess he could have called me?

atleast he will ship them to me free of charge now, but it'll be after the weekend :( :(

Re: 1969 Custom/10 clean up
 

Just read through your entire post, cool man. Hey, on your brakes, is your proportion valve hooked up correctly? I tried looking at your pictures but I couldn't really tell. Just to check, here are pics on mine in my 69 and a diagram to help.

My other "front" line out is plugged because I have a "T" down by the frame that separates the line so it can go left & right. You can plug one of the fronts to it and the other front comes from the left side (the way you have it mounted on your firewall) And the rear brakes would come from the top
https://scontent-sjc2-1.xx.fbcdn.net...06498035_o.jpg

This view shows the other front brake line, or in my case my only front line
https://scontent-sjc2-1.xx.fbcdn.net...06541531_o.jpg

And here is the diagram to better help.
https://scontent-sjc2-1.xx.fbcdn.net...f8&oe=55C8082D

Disregard my brake line Xing. I had bought the proportioning valve kit years before installing it and just never changed it. It never fit the "right" way like it was supposed to and I didn't want to buy a different setup since it works perfectly just the way it is.

Re: 1969 Custom/10 clean up
 

Thanks Bigmike for the input and love how you mounted the proportioning valve, the brake line cross looks good.
atleast I now now I have hooked up everything correctly, so thanks for the diagrams.
due to a bank holiday my rear drums didn't get delivered yet, so me and two friends tried to mount the doors..OMG..I never imagined it being so difficult .
I'll have to take of the front fenders again, to get good acces to the bolts of the hinges.

Re: 1969 Custom/10 clean up
 

Wow and suddenly we're three months down the road again..

This is how she looks now:
http://www.mijnalbum.nl/Foto540-TCRJN836.jpg
http://www.mijnalbum.nl/Foto540-A4GVXQJW.jpg

So we got the doors fitted, took us a lot of time, including taking of the fenders again, just to get normal access to the hinges.
Also replaced the vent window rubbers, which is quite a pain, but with patience it's doable.

Brakes..yes lets talk brakes; we got the new brakes drums in the back mounted, replaced the master brake cilinder one more time..bled the brakes until we went crazy and the result? the brakes work..kinda.
so with the engine turned of the brake pedal is hard, but turn the engine on and I punch the pedal to the medal...so I'm still not a 100% happy..but it stops in a acceptable way, meaning it won't lock up 4 wheels, but I'll be able to stop it before running into a concrete wall.
So at this point I'm not doing anything about the brakes anymore until I take it for MOT.

So now on to the next subject, the harmonic balancer.
I thought mine was shot, because of the clunking sound when the engine iddled and I had already bought a replacement one. I had taken pictures and went down to a second hand parts shop, who told me:"oh you have a small balancer, like on the 327 engine".. now I didn't give that remark a second thought until I watched instructual video's about changing the balancer.
I saw that the difference between the 350 and the 327 is that the 327 crankshaft doesn't have a threaded hole..like my engine, so do I have a 327 than?
http://www.mijnalbum.nl/Foto540-I7Z6YP6S.jpg
Ok and the problem turned out to be the pulley that had come loose..so I stuck in 3 bolts with locknuts on the back, now I'm sure it won't come off anymore.

Re: 1969 Custom/10 clean up
 

Next problem I tackled is my leaking powersteering..and being the smart guy I am, I decided to get e revision set and do it my self.
http://www.mijnalbum.nl/Foto540-AG86IYPQ.jpg

ofcourse it all end in tears, because we didn;t manage to get the pulley off without damaging it and to make things worse, we managed to damage the pulley axle (using a power grinder isn't always the best solution)

so I'm on the LMC website now, ordering a new set.

Let see what happens to the steering gear, which I brought to a hydraulic specialist to be overhauld..

Re: 1969 Custom/10 clean up
 

You have some bad luck with your engine Steve..
Hope all gets better from now on!

Re: 1969 Custom/10 clean up
 

My old 283 doesn't have a threaded hole in the nose of the crank either. Oh and there is a special tool for pulling those power steering pump pulleys. Not expensive.

Never heard of anyone having as many problems getting the brakes to work properly as you. Very odd. Don't slam into any concrete barriers. The barriers will win every time.

Re: 1969 Custom/10 clean up
 

I'm along for the ride. Interesting to see these c10s all over the world. Were they ever sold new over there? Good luck overcoming your problems. Perseverance wins out in the end.
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Re: 1969 Custom/10 clean up
 

Ah well...it's only a hobby right, so I'm not loosing any sleep over it, I think :)

Yes I have seen the tool, but ordering would take long and we figured we’d manage with a regular puller… lesson learned so to speak.
Regarding the brakes..at some point in the future, I’m going to exclude the brake balancer and see if that changes anything, but for now..let it be.

Perseverance /pəːsɪˈvɪər(ə)ns/ [persistence in doing something despite difficulty or delay in achieving success] hmmm seems I need patience as well , but I’m close to running out of it.

Re: 1969 Custom/10 clean up
 

So we're three weeks down the road and yesterday I finally get a call from the shop who was supposed to overhaul my steering gear... they hadn't even gotten started yet, because they can't find the parts???

I'll be picking it up tomorrow after work and tell them in mostly 4 letter words what I think of there service..

I checked online at LMC and for a complete pump including the resevoir cap, pulley and the steering gear. It would cost me $337,- wich in my book is very acceptable. Ordering it in the Netherlands though, brings some extra costs with it, so for me to have it laying on my workbench it'll set me back $550,-

what else have I been keeping myself busy with? well together with a mate we completed the doors. we put on the side mirrors, made some door panels which are now off to be painted, replaced the vent window rubbers.

http://www.mijnalbum.nl/Foto360-WGFFKPDD.jpg
http://www.mijnalbum.nl/Foto360-TZZH4SIS.jpg



Oh and we bought another truck..
yes I know we haven't finished the 69 yet..but along came this 1950 GMC 3100 with was someones project car. luckily for us he wanted to get rid of it :)
All the hard labor has been done, so there's no rust to be found in the car anymore..it's just a huge jiggsaw puzzle. I'll be opening a seperate thread for this.
http://www.mijnalbum.nl/Foto360-6BSUVCHT.jpg