Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72freak · 01-25-2014, 07:18 AM

We have done brakes on 100's of vehicles here at Rottenwood Garage so I am fairly certain I have the procedure down. LOL. HOWEVER, we are having trouble with a 69 C10 2x4 that we just converted from power drums to front disc. The kit he ordered came from Brothers with all the brake components, spindles and the prop valve. We used the booster I had put on the truck when I converted it to power drums a few years ago and it works fine. We bought a 72 disc brake master cylinder to complete the system. Its all together, no leaks, bled out with no air in the lines and the rear brakes are weak and when you turn the truck on so the booster is working the pedal goes to the floor. We bleed it out while not running and end up with a solid pedal but as soon as you start the truck it goes to the floor and at that point there is no rear brakes and the front seem to grab a little. We did bench bleed the master and all of the flexible hoses and rear brake components are newer..We are stumped. We are going to put a fresh set of eyes on it this morning when all the guys come over so we may get it figured out but I wanted to see if any of you have had the same experience and what was your solution..

panhandler62 · 01-25-2014, 10:25 AM

Do you have the correct actuating arm in the booster for the new master cylinder?

72freak · 01-25-2014, 05:41 PM

Quote:

Originally Posted by panhandler62

Do you have the correct actuating arm in the booster for the new master cylinder?

I will check that out. I will measure the depth of the 2 different masters and see if they are different. Good thing to check.

72freak · 01-30-2014, 10:05 AM

Thanks for all the ideas. We figured it out.

earl84 · 01-30-2014, 10:08 AM

Inquiring minds want to know, what was the issue, and how did you fix it?

72freak · 01-30-2014, 11:28 AM

Quote:

Originally Posted by earl84

Inquiring minds want to know, what was the issue, and how did you fix it?

We all stepped back and let one man check the work of 5 people. Turned out the person who installed the front brake calipers was also the one who was in charge of bleeding the front brake calipers. FYI, if the calipers are on the wrong side with the bleeder screws pointed down, you wont get the system free of air.

panhandler62 · 01-30-2014, 02:28 PM

That'll do it.

whitedog76 · 01-30-2014, 03:06 PM

I'm hoping that guys is someone's kid or an apprentice.

72freak · 01-31-2014, 07:45 AM

Quote:

Originally Posted by whitedog76

I'm hoping that guys is someone's kid or an apprentice.

Mistakes happen. I'm sure the most experienced mechanics make them too.
I actually did the same thing with my F550 last year. The boxes were marked left and right but I didn't know there was a front of caliper or rear of caliper option and it was not listed as an option.. I mounted them correctly according to the box. I did figure it out once I started to bleed though.

panhandler62 · 01-31-2014, 08:20 AM

You show me someone not making mistakes and I'll show you someone not doing any work.

01-25-2014, 07:18 AM	#1
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. We have done brakes on 100's of vehicles here at Rottenwood Garage so I am fairly certain I have the procedure down. LOL. HOWEVER, we are having trouble with a 69 C10 2x4 that we just converted from power drums to front disc. The kit he ordered came from Brothers with all the brake components, spindles and the prop valve. We used the booster I had put on the truck when I converted it to power drums a few years ago and it works fine. We bought a 72 disc brake master cylinder to complete the system. Its all together, no leaks, bled out with no air in the lines and the rear brakes are weak and when you turn the truck on so the booster is working the pedal goes to the floor. We bleed it out while not running and end up with a solid pedal but as soon as you start the truck it goes to the floor and at that point there is no rear brakes and the front seem to grab a little. We did bench bleed the master and all of the flexible hoses and rear brake components are newer..We are stumped. We are going to put a fresh set of eyes on it this morning when all the guys come over so we may get it figured out but I wanted to see if any of you have had the same experience and what was your solution.. __________________ 2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! *It's not just a hobby..It's a LIFESTYLE!!!* Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere!

01-25-2014, 10:25 AM	#2
panhandler62 Java Mechanic Join Date: Jun 2005 Location: Martinsburg, WV Posts: 6,763	Re: Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. Do you have the correct actuating arm in the booster for the new master cylinder? __________________ Keith 11 Lincoln MKT -- Momma's wagon 13 G37xS -- middle age crazy car 68 C20 Fleetside -- RIP Decorating the whole town up at a cost of $27 ....

01-30-2014, 10:05 AM	#4
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	Re: Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. Thanks for all the ideas. We figured it out. __________________ 2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! *It's not just a hobby..It's a LIFESTYLE!!!* Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere!

01-30-2014, 10:08 AM	#5
earl84 Registered User Join Date: Aug 2011 Location: Montrose, CO Posts: 972	Re: Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. Inquiring minds want to know, what was the issue, and how did you fix it?

01-30-2014, 02:28 PM	#7
panhandler62 Java Mechanic Join Date: Jun 2005 Location: Martinsburg, WV Posts: 6,763	Re: Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. That'll do it. __________________ Keith 11 Lincoln MKT -- Momma's wagon 13 G37xS -- middle age crazy car 68 C20 Fleetside -- RIP Decorating the whole town up at a cost of $27 ....

01-30-2014, 03:06 PM	#8
whitedog76 Registered User Join Date: Jan 2014 Location: Peoria, IL Posts: 1,450	Re: Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. I'm hoping that guys is someone's kid or an apprentice.

01-31-2014, 08:20 AM	#10
panhandler62 Java Mechanic Join Date: Jun 2005 Location: Martinsburg, WV Posts: 6,763	Re: Disc brake swap, now no brakes? Pedal to the floor when truck is turned on. You show me someone not making mistakes and I'll show you someone not doing any work. __________________ Keith 11 Lincoln MKT -- Momma's wagon 13 G37xS -- middle age crazy car 68 C20 Fleetside -- RIP Decorating the whole town up at a cost of $27 ....



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