52 chevy brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chopper tom · 01-25-2008, 12:40 AM

Hy, new to the forum here!
I have a 50 and a 52 chevy truck and have some queations ?
I put a dual bowl mastercylinder on the 52 with 2 10lb residual valves and changed the mc twice and still can only get about a 1 1/2 pedal on the brakes.It has a drum -drum set up.
And on the 50 i cant get the hood to shute allthe way down like it should no matter how i try to adjust it?
Any ideas???

jkaylor68gmc · 01-25-2008, 12:42 AM

O.k. Your brakes first. Where and how did you mount the master cylinder?

Second, you said you placed 10 pound residual valves. i am assuming you may have bolted it under the floor, Is this true. Where did you get the master cylinder?

chopper tom · 01-25-2008, 10:38 AM

The mc is in the original spot under the floor .
The mc came from a 77chevy truck[manual],new from the auto parts store.It is the second one i have tryed and still the same problems.The brakes work great but have to pump at least 1 1/2 times to stop?

1-ton of fun · 01-25-2008, 01:07 PM

are you losing fluid?

have you bled the brakes and the master cylinder? it sounds like either air in the system or a leak.

chopper tom · 01-25-2008, 01:16 PM

No leaks and have been bleed numoris times ,and even whith a hand pump bleeder and still same results .
I really dont understand it .My 50 has a camaro sub frame with disc's and thats the only differance betreen the two trucks and the 50 has awsome brake's?
It's got me stumped????

Kateaux · 01-25-2008, 10:29 PM

Sounds to me like your residual valve is not maintaining pressure. What kind are you using and where are they placed in the brake circuit?

Kateaux

chopper tom · 01-26-2008, 12:38 AM

I'm useing a speed way in back and a wilwood up front.they are located midway on back and just after irt comes out of themc up front.
Thank yall for trying to help out!

1-ton of fun · 01-26-2008, 01:05 AM

is the mc push rod adjusted properly?

chopper tom · 01-26-2008, 01:07 AM

I beleive so.
but how do you guys adjust yours?

Kateaux · 01-26-2008, 07:00 AM

The residual valves are directional, are the in's and out's in the right direction? Is the pedal giving enough travel on the plunger into the MC?

K8O

chopper tom · 01-26-2008, 08:14 AM

Yep,yep,and yep.
Thats why i dont understand either?

orgalmeister · 01-26-2008, 10:48 PM

I wish I could be more help...try this http://www.mpbrakes.com/technical-su...leshooting.cfm

I'm not 100% sure but I think there is a difference between power master cylinders and manual. Also between drum and disc.

chopper tom · 01-27-2008, 01:57 AM

Quote:

Originally Posted by orgalmeister

I wish I could be more help...try this http://www.mpbrakes.com/technical-su...leshooting.cfm

I'm not 100% sure but I think there is a difference between power master cylinders and manual. Also between drum and disc.

Wow ,thats a good sight !Thanks a bunch!

01-25-2008, 12:40 AM	#1
chopper tom Registered User Join Date: Jan 2008 Location: whitesburg,KY Posts: 85	52 chevy brakes Hy, new to the forum here! I have a 50 and a 52 chevy truck and have some queations ? I put a dual bowl mastercylinder on the 52 with 2 10lb residual valves and changed the mc twice and still can only get about a 1 1/2 pedal on the brakes.It has a drum -drum set up. And on the 50 i cant get the hood to shute allthe way down like it should no matter how i try to adjust it? Any ideas???

01-25-2008, 12:42 AM	#2
jkaylor68gmc Senior Member Join Date: Dec 2005 Location: TN Posts: 2,448	Re: 52 chevy brakes O.k. Your brakes first. Where and how did you mount the master cylinder? Second, you said you placed 10 pound residual valves. i am assuming you may have bolted it under the floor, Is this true. Where did you get the master cylinder? __________________ 1947 International KB-1 1957 Chevy Bel-Air riding low 1962 swb fleetside 2002 Chevrolet Silverado 7-inch lift on 35 Daily driver 2016 Chevy Tahoe Better halves ride

01-25-2008, 10:38 AM	#3
chopper tom Registered User Join Date: Jan 2008 Location: whitesburg,KY Posts: 85	Re: 52 chevy brakes The mc is in the original spot under the floor . The mc came from a 77chevy truck[manual],new from the auto parts store.It is the second one i have tryed and still the same problems.The brakes work great but have to pump at least 1 1/2 times to stop?

01-25-2008, 01:07 PM	#4
1-ton of fun polishing a turd Join Date: Dec 2004 Location: houston, tx Posts: 674	Re: 52 chevy brakes are you losing fluid? have you bled the brakes and the master cylinder? it sounds like either air in the system or a leak. __________________ 59 chevy apache 31 4x4 - my project: http://67-72chevytrucks.com/vboard/s....php?p=8668512 53 buick special - straight 8 sled - blow through turbo 47 gmc - flatbed hot rod build 99 ford econoline e350 - 4x4 converted family roadtrip/overlanding rig AKA 'Monstervan' AKA 'Daddy-Van'

01-25-2008, 01:16 PM	#5
chopper tom Registered User Join Date: Jan 2008 Location: whitesburg,KY Posts: 85	Re: 52 chevy brakes No leaks and have been bleed numoris times ,and even whith a hand pump bleeder and still same results . I really dont understand it .My 50 has a camaro sub frame with disc's and thats the only differance betreen the two trucks and the 50 has awsome brake's? It's got me stumped????

01-25-2008, 10:29 PM	#6
Kateaux Registered User Join Date: Sep 2007 Location: Dacula Georgia Posts: 57	Re: 52 chevy brakes Sounds to me like your residual valve is not maintaining pressure. What kind are you using and where are they placed in the brake circuit? Kateaux

01-26-2008, 12:38 AM	#7
chopper tom Registered User Join Date: Jan 2008 Location: whitesburg,KY Posts: 85	Re: 52 chevy brakes I'm useing a speed way in back and a wilwood up front.they are located midway on back and just after irt comes out of themc up front. Thank yall for trying to help out!

01-26-2008, 01:05 AM	#8
1-ton of fun polishing a turd Join Date: Dec 2004 Location: houston, tx Posts: 674	Re: 52 chevy brakes is the mc push rod adjusted properly? __________________ 59 chevy apache 31 4x4 - my project: http://67-72chevytrucks.com/vboard/s....php?p=8668512 53 buick special - straight 8 sled - blow through turbo 47 gmc - flatbed hot rod build 99 ford econoline e350 - 4x4 converted family roadtrip/overlanding rig AKA 'Monstervan' AKA 'Daddy-Van'

01-26-2008, 01:07 AM	#9
chopper tom Registered User Join Date: Jan 2008 Location: whitesburg,KY Posts: 85	Re: 52 chevy brakes I beleive so. but how do you guys adjust yours?

01-26-2008, 07:00 AM	#10
Kateaux Registered User Join Date: Sep 2007 Location: Dacula Georgia Posts: 57	Re: 52 chevy brakes The residual valves are directional, are the in's and out's in the right direction? Is the pedal giving enough travel on the plunger into the MC? K8O

01-26-2008, 08:14 AM	#11
chopper tom Registered User Join Date: Jan 2008 Location: whitesburg,KY Posts: 85	Re: 52 chevy brakes Yep,yep,and yep. Thats why i dont understand either?

01-26-2008, 10:48 PM	#12
orgalmeister Registered User Join Date: Aug 2004 Location: North Carolina Posts: 291	Re: 52 chevy brakes I wish I could be more help...try this http://www.mpbrakes.com/technical-su...leshooting.cfm I'm not 100% sure but I think there is a difference between power master cylinders and manual. Also between drum and disc. __________________ '56 truck (the never ending project) '06 Z/71 loaded (daily driver) '07 Mercedes-Benz C-Class (wife's driver) Gone: 72 SB, 67 CST, 57 BBW, 47 Panel streetrod,



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