Question about 1991 GMC G3500
New master cycl brake peddle holds until I start my truck peddle goes to floor
Bleed the brake system, You should have bled the master cyl on the bench before installation..
Posted on May 12, 2014
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: Park Brake Adjustment
Park Brake Adjustment (Disc Brake)
j 21177-A Drum-to-Brake Shoe Clearance Gage
Park Brake Shoe Adjustment
Caution: Refer to Brake Dust Caution.
Important: The park brake shoes must be adjusted before the park brake cable tension is adjusted.Set the J 21177-A so it contacts the inside diameter of the rotor
Important: Before you adjust the park brake cable tension, verify that the park brake shoes are adjusted to provide a clearance of 0.6604 mm (0.026 in) and the rear disc brake rotors are installed.
Posted on Feb 22, 2009
Its possible your master cylinder went bad, but if it wasnt bad just before you changed brakes i doubt thats it. Check your rear wheel cylinders that push out the pads to make sure their not leaking. Also check for leaking brakelines. Hope this helps.
Posted on Mar 22, 2009
It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.
Posted on Sep 15, 2009
Testimonial: "Hadn't thought about the O-rings on the rod thanks for the idea. Great Idea Thanks!"
You gotta bleed your brakes and get all the air out dude. Then put in new brake fluid. Afterwards, make sure to pump the hell out of your brakes to build up brake pressure before you put this thing in drive or you will end up in the neighbors fence or a tree will stop you.
Posted on Oct 24, 2009
check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now
Posted on Dec 09, 2009
Tips for a great answer:
Sep 27, 2012 | 2003 GMC Envoy
Aug 30, 2012 | 1998 Chrysler Town & Country
Dec 31, 2011 | 2004 Chevrolet Cavalier
Aug 04, 2010 | Ford F-250 Cars & Trucks
Apr 07, 2010 | 2003 Ford Escape
Dec 14, 2009 | 2001 Pontiac Aztek
Sep 15, 2009 | 2000 GMC Jimmy
Oct 15, 2008 | Volkswagen Golf Cars & Trucks
Sep 27, 2008 | Jeep CJ5 Cars & Trucks
129 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: