Front Brakes Don't Work - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Stickman · 03-06-2012, 09:32 PM

Replaced my front rotors and calipers,master cyl, booster, proportioning valve and I did bench bleed the master before installing in my 72 PU.I have ran at least 3 Qts of fluid through the system using the Motive products power bleeder.I purchaed the rotors,calipers,and proportioning valve from CPP.Any thoughts or suggestions would be helpful.

Thanks,Kirk

**lolife99** · 03-07-2012, 03:19 PM

Does it seem like you have removed all the air from the system?

Stickman · 03-07-2012, 08:26 PM

Thanks for the reply.I've bled them minimum half dz times and probably more.I checked for leaks and everything is tight.I talked to a guy from CPP today and he suggested gravity bleeding them so I'll try that tomorrow and I'm gonna check my vac press again.My pedal goes about a qtr the way down then catches but it's just the back brakes that work.If I pump it again they catch quickly but again it's only the back.

KQQL IT · 03-07-2012, 09:02 PM

Prop valve kicked over? Not allowing fluid to the calipers?
Posted via Mobile Device

**lolife99** · 03-07-2012, 09:11 PM

Stock style M/C?
Pedal rod the correct length?

Silly question,... But the last problem like this,... the owner had the calipers on upside down. (wrong side of the truck)
The bleeders were on the bottom.

Stickman · 03-08-2012, 04:56 AM

Quote:

Originally Posted by KQQL IT

Prop valve kicked over? Not allowing fluid to the calipers?
Posted via Mobile Device

I talked to a salesman from CPP yesterday whom I bought the prop valve from (cat#PV-2) and he didn't say anything about that. What does that mean and how do I fix it if that's the problem?

Thanks,Kirk

Stickman · 03-08-2012, 04:58 AM

Quote:

Originally Posted by lolife99

Stock style M/C?
Pedal rod the correct length?

Silly question,... But the last problem like this,... the owner had the calipers on upside down. (wrong side of the truck)
The bleeders werw on the bottom.

Bleeders on top pointed toward the sky.Thanks again for the help.

rcbildr · 03-08-2012, 06:19 AM

Are the hoses new? How well did they gravity bleed? I had a hose that was totally collapsed on the inside and it wouldn't gravtiy bleed, but it would let enough fluid thru for when my girlfriend helped me bleed the brakes.

Stickman · 03-08-2012, 09:51 AM

Quote:

Originally Posted by rcbildr

Are the hoses new? How well did they gravity bleed? I had a hose that was totally collapsed on the inside and it wouldn't gravtiy bleed, but it would let enough fluid thru for when my girlfriend helped me bleed the brakes.

Brand new,came with the calipers.I'm doing the gravity feed today so we'll find out.Do I do the gravity one wheel at a time or all four at the same time?

Thanks,Kirk

03-06-2012, 09:32 PM	#1
Stickman Registered User Join Date: Mar 2008 Location: Chandler,AZ Posts: 576	Front Brakes Don't Work Replaced my front rotors and calipers,master cyl, booster, proportioning valve and I did bench bleed the master before installing in my 72 PU.I have ran at least 3 Qts of fluid through the system using the Motive products power bleeder.I purchaed the rotors,calipers,and proportioning valve from CPP.Any thoughts or suggestions would be helpful. Thanks,Kirk

03-07-2012, 03:19 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Front Brakes Don't Work Does it seem like you have removed all the air from the system? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-07-2012, 08:26 PM	#3
Stickman Registered User Join Date: Mar 2008 Location: Chandler,AZ Posts: 576	Re: Front Brakes Don't Work Thanks for the reply.I've bled them minimum half dz times and probably more.I checked for leaks and everything is tight.I talked to a guy from CPP today and he suggested gravity bleeding them so I'll try that tomorrow and I'm gonna check my vac press again.My pedal goes about a qtr the way down then catches but it's just the back brakes that work.If I pump it again they catch quickly but again it's only the back.

03-07-2012, 09:02 PM	#4
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,254	Re: Front Brakes Don't Work Prop valve kicked over? Not allowing fluid to the calipers? Posted via Mobile Device __________________ " That didnt make it any newer " " Dont antique the equipment "

03-07-2012, 09:11 PM	#5
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Front Brakes Don't Work Stock style M/C? Pedal rod the correct length? Silly question,... But the last problem like this,... the owner had the calipers on upside down. (wrong side of the truck) The bleeders were on the bottom. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 03-08-2012 at 10:03 AM.

03-08-2012, 06:19 AM	#8
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: Front Brakes Don't Work Are the hoses new? How well did they gravity bleed? I had a hose that was totally collapsed on the inside and it wouldn't gravtiy bleed, but it would let enough fluid thru for when my girlfriend helped me bleed the brakes. __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28



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