The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Brakes

don t. - 72gmc · 05-20-2002, 08:07 AM

God, I edited this and its still long. I wanted to remove more but stay informative.

Started 8 weeks ago, a complete brake r&r. Why? Front pass was only thing stopping truck, pedal needed help comming up, seepage in 2 middle sections of the hard lines.
Replaced wh. cyls, 3 flex hoses, hard lines, fr. calipers, mstr cyl., turned rear drums, had to replace fr. rotors (bearings/grease seal just cuz I was there). Used old prop. valve and front T fitting. These I cleaned up/blew comp. air thru. Prior owner had replaced pads, shoes, one section of hard line.
Got it back together Sat. afternoon. Bench blead mstr., installed. Gravity blead(mstr cover off), started w/rears. Worked ok, then flow stopped. Figured since its a dual master, grav blead fronts, no problem. Still no flow from rear. I had 1 leak to rear, 1 to front, both couplings needed tightening. Still no rear flow.
Sunday...neighbor helped w/manual bleed(mstr cover just sitting on mstr). Started w/rears, doing great, both sides(had a leak by rear flex hose, fixed). Did fronts in half the time of rears, no problem, flow great.
Here's where problem starts. Went back to rear dr. side, flow started to decrease. Rear pass side same. Went back to fronts, started good and got worse/same as rears. Took 45 mins to bleed 12 oz. bottle thru system. Called brother who said master cover needed to be sealed/clipped down and start over. Bench blead mstr, no prob. and reinstalled. Blead thru prop valve, no problem. Connected prop valve. Blead almost 1 qt. thru entire system (took almost 2 hrs.), nothing more than drops, no stream unless I let everything sit for 10 minutes or more. Multiple pumps on pedal help only on first bleed at each corner, then decreases even if you increase pedal pumps.
At this point
A - i've never ran into the above. Its all new parts, from NAPA, what the muck!
B - I just don't know. Brother says keep bleeding but 1 qt. over 2 hours and no better. I trust him but?????
C - the wife is ticked that this "thing aint done". Like this helps!!!
Any help is greatly appreciated!
.....don t. .....

------------------
It aint gonna be a trailer queen, its gotta work, just like me.
3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60.

[This message has been edited by don t. - 72gmc (edited May 20, 2002).]

[This message has been edited by don t. - 72gmc (edited May 20, 2002).]

05-20-2002, 08:07 AM	#1
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 389	Brakes - round 3 of a 4 round battle God, I edited this and its still long. I wanted to remove more but stay informative. Started 8 weeks ago, a complete brake r&r. Why? Front pass was only thing stopping truck, pedal needed help comming up, seepage in 2 middle sections of the hard lines. Replaced wh. cyls, 3 flex hoses, hard lines, fr. calipers, mstr cyl., turned rear drums, had to replace fr. rotors (bearings/grease seal just cuz I was there). Used old prop. valve and front T fitting. These I cleaned up/blew comp. air thru. Prior owner had replaced pads, shoes, one section of hard line. Got it back together Sat. afternoon. Bench blead mstr., installed. Gravity blead(mstr cover off), started w/rears. Worked ok, then flow stopped. Figured since its a dual master, grav blead fronts, no problem. Still no flow from rear. I had 1 leak to rear, 1 to front, both couplings needed tightening. Still no rear flow. Sunday...neighbor helped w/manual bleed(mstr cover just sitting on mstr). Started w/rears, doing great, both sides(had a leak by rear flex hose, fixed). Did fronts in half the time of rears, no problem, flow great. Here's where problem starts. Went back to rear dr. side, flow started to decrease. Rear pass side same. Went back to fronts, started good and got worse/same as rears. Took 45 mins to bleed 12 oz. bottle thru system. Called brother who said master cover needed to be sealed/clipped down and start over. Bench blead mstr, no prob. and reinstalled. Blead thru prop valve, no problem. Connected prop valve. Blead almost 1 qt. thru entire system (took almost 2 hrs.), nothing more than drops, no stream unless I let everything sit for 10 minutes or more. Multiple pumps on pedal help only on first bleed at each corner, then decreases even if you increase pedal pumps. At this point A - i've never ran into the above. Its all new parts, from NAPA, what the muck! B - I just don't know. Brother says keep bleeding but 1 qt. over 2 hours and no better. I trust him but????? C - the wife is ticked that this "thing aint done". Like this helps!!! Any help is greatly appreciated! .....don t. ..... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60. [This message has been edited by don t. - 72gmc (edited May 20, 2002).] [This message has been edited by don t. - 72gmc (edited May 20, 2002).]