Brake question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bruin_d · 08-10-2011, 07:11 PM

With all new master cylinder, brake lines/hoses, booster, prop valve. How long should it take to bleed them? I've been going for a decent amount of time and still can't get the pedal to come up. I need to know if i keep going or if I have a bigger problem.

JimKshortstep4x4 · 08-10-2011, 08:52 PM

It can take some time to bleed the air out of the system, especially the rear brakes.

You may want to loosen the lines (one at a time) on the outlet side of the prop valve just to make sure that fluid is getting past it.

Jim

68gmsee · 08-10-2011, 09:23 PM

Starting with the rear it shouldn't take more than 5 minutes of pumping. That's by the push and hold method. I just did mine and bled all the brakes in about 30 minutes. If you're doing by a different method I'm not sure.

If you have followed the directions exactly including prepping the master cylinder before you installed it than you may have a defective master cylinder. If this is a completely new (conversion) installation, then double check all the link adjustments.

*mrhino* · 08-12-2011, 07:08 PM

howed you make out. got them bled yet?

bruin_d · 08-12-2011, 07:54 PM

Quote:

Originally Posted by mrhino

howed you make out. got them bled yet?

I did end up getting them bled. I needed to adjust my linkage going to the booster. It wasn't engaging the master cylinder plunger enough and i wasn't get a deep enough stroke on the master cylinder to build up any pressure. I am running the under dash setup from Scott's Hotrods there was a bunch of other variables that i wasn't sure about. I also just needed to have a little more patience because there is about 4 miles of brake line on a Suburban... I made ALL of the brake lines from scratch and have never bled a completely new system so I was trying to figure out how long it should take so i would know when to start looking for problems outside of just the brake lines.

*mrhino* · 08-12-2011, 10:11 PM

thats cool, I just saw no one had really helped so i thought i ask. i had similar problem. brake arm ratio was off. not pushing on the m/c far enough.

bruin_d · 08-12-2011, 10:17 PM

Quote:

Originally Posted by mrhino

thats cool, I just saw no one had really helped so i thought i ask. i had similar problem. brake arm ratio was off. not pushing on the m/c far enough.

I appreciate it man.

08-10-2011, 07:11 PM	#1
bruin_d Registered User Join Date: Mar 2011 Location: Chesapeake, VA Posts: 578	Brake question With all new master cylinder, brake lines/hoses, booster, prop valve. How long should it take to bleed them? I've been going for a decent amount of time and still can't get the pedal to come up. I need to know if i keep going or if I have a bigger problem. __________________ My 72 Suburban Build - http://67-72chevytrucks.com/vboard/s...d.php?t=454019 79 Volvo Turbo LS Build - http://67-72chevytrucks.com/vboard/s...d.php?t=594252 Buggy Bed for son - http://67-72chevytrucks.com/vboard/s...d.php?t=657350

08-10-2011, 08:52 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Brake question It can take some time to bleed the air out of the system, especially the rear brakes. You may want to loosen the lines (one at a time) on the outlet side of the prop valve just to make sure that fluid is getting past it. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

08-10-2011, 09:23 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Brake question Starting with the rear it shouldn't take more than 5 minutes of pumping. That's by the push and hold method. I just did mine and bled all the brakes in about 30 minutes. If you're doing by a different method I'm not sure. If you have followed the directions exactly including prepping the master cylinder before you installed it than you may have a defective master cylinder. If this is a completely new (conversion) installation, then double check all the link adjustments.

08-12-2011, 07:08 PM	#4
mrhino Account Suspended Join Date: Aug 2007 Location: USA Posts: 1,223	Re: Brake question howed you make out. got them bled yet?

08-12-2011, 10:11 PM	#6
mrhino Account Suspended Join Date: Aug 2007 Location: USA Posts: 1,223	Re: Brake question thats cool, I just saw no one had really helped so i thought i ask. i had similar problem. brake arm ratio was off. not pushing on the m/c far enough.



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