71 blazer brake issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SACRAMENTO 71 · 10-19-2013, 02:58 PM

(MOVED ORIGNIAL THREAD HERE!)

Good morning Everyone, hope the weekend is going well so far

Have a situation for you, and would REALLY appreciate as much input or advise as possible.

Truck Info: 1971 Blazer, Disc/Drum set up. All Stock axels

Recent Project: Checked rear brakes and noticed they need refreshing. So I installed new rear hardware (springs, clips, etc) new wheel cyls on both sides, had the drums mechined, and put new pads. Everything went great and I noticed a huge difference.

One week after the completion of the rear brakes project, i noticed that the truck felt sluggish on my way home ONLY, not in the mornings! The following day it got so bad that in traffic I did not need to use the brakes!! The truck would stop by it self!!!

Checked from brakes and the front left caliber was stuck/locked. So I bought new calibers, pads, turned rotors and completely flushed the system. Worked great for a few days and then on my way home from work i noticed that only my front brakes were working..............

So to sum it up, did the rear brakes, then the fronts started sticking. Fixed the fronts and lost all rear brakes????

Any ideas were to start????? PPV's? Master? Booster?

THANK YOU SO MUCH FOR YOUR HELP!!!! I always appreciate the time I get from all your responses! Nick

Mike C · 10-20-2013, 10:17 AM

My next step would be rubber hoses. They are a multi-layer design and it is possible for the inside layer to peel away and block off the hose. I have had this happen multiple times now with rubber brake lines and it can be nearly impossible to diagnose if you aren't looking for it.

Once you do the lines then you can proceed to diagnose if you still need to. Replacing the lines will also serve to flush the entire brake system again which would be the next step anyhow.

SACRAMENTO 71 · 10-22-2013, 07:54 PM

Thanks Mike C, I have steel braided in front and rubber line in back. After check the back line I noticed it bubbling outward need the connection.......NOT GOOD!!

I'm replacing that first, then testing the MC. Depending on the outcome, proportioning valve is next. Thank you for the response, Nick

10-19-2013, 02:58 PM	#1
SACRAMENTO 71 Registered User Join Date: Aug 2012 Location: Sacramento, CA Posts: 242	71 blazer brake issue (MOVED ORIGNIAL THREAD HERE!) Good morning Everyone, hope the weekend is going well so far Have a situation for you, and would REALLY appreciate as much input or advise as possible. Truck Info: 1971 Blazer, Disc/Drum set up. All Stock axels Recent Project: Checked rear brakes and noticed they need refreshing. So I installed new rear hardware (springs, clips, etc) new wheel cyls on both sides, had the drums mechined, and put new pads. Everything went great and I noticed a huge difference. One week after the completion of the rear brakes project, i noticed that the truck felt sluggish on my way home ONLY, not in the mornings! The following day it got so bad that in traffic I did not need to use the brakes!! The truck would stop by it self!!! Checked from brakes and the front left caliber was stuck/locked. So I bought new calibers, pads, turned rotors and completely flushed the system. Worked great for a few days and then on my way home from work i noticed that only my front brakes were working.............. So to sum it up, did the rear brakes, then the fronts started sticking. Fixed the fronts and lost all rear brakes???? Any ideas were to start????? PPV's? Master? Booster? THANK YOU SO MUCH FOR YOUR HELP!!!! I always appreciate the time I get from all your responses! Nick __________________ 68 C10 SWB W/ 72 FRONT CLIP 343SB TH400 64 C10 SWB 406SB TH400 74 SUBURBAN 454BB TH400 78 K10 SWB 350 TH350 6" ON 35" BFG MUD 71 K5 350 W/ TBI 700R4 6" ON 38" BFG MUD 00 K3500 DRW BIG BLOCK "DRINKING PRBLM"

10-20-2013, 10:17 AM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,714	Re: 71 blazer brake issue My next step would be rubber hoses. They are a multi-layer design and it is possible for the inside layer to peel away and block off the hose. I have had this happen multiple times now with rubber brake lines and it can be nearly impossible to diagnose if you aren't looking for it. Once you do the lines then you can proceed to diagnose if you still need to. Replacing the lines will also serve to flush the entire brake system again which would be the next step anyhow. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

10-22-2013, 07:54 PM	#3
SACRAMENTO 71 Registered User Join Date: Aug 2012 Location: Sacramento, CA Posts: 242	Re: 71 blazer brake issue Thanks Mike C, I have steel braided in front and rubber line in back. After check the back line I noticed it bubbling outward need the connection.......NOT GOOD!! I'm replacing that first, then testing the MC. Depending on the outcome, proportioning valve is next. Thank you for the response, Nick __________________ 68 C10 SWB W/ 72 FRONT CLIP 343SB TH400 64 C10 SWB 406SB TH400 74 SUBURBAN 454BB TH400 78 K10 SWB 350 TH350 6" ON 35" BFG MUD 71 K5 350 W/ TBI 700R4 6" ON 38" BFG MUD 00 K3500 DRW BIG BLOCK "DRINKING PRBLM"



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