Question about Cars & Trucks
I have changed the master cylinder
I assume that you have disc brakes. These require a piston/s to push against the pads to tighten them onto the discs. 2 reasons they may not be working are the calliper pistons are seized up in the callipers and 2 the brake booster is not providing the power assist to actuate the callipers. If you have vacuum booster I would repair/replace the booster or check for vacuum at the booster hose. If you have electric pump booster then check that the pump is getting power and is working.
Posted on Nov 23, 2014
When changing a master cylinder you have to fill and bleed before hooking up main lines to back. Then you have to bleed the whole system. You just have an air pocket in your system. GOOD LUCK FRIEND.
Posted on Nov 23, 2014
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Posted on Jan 02, 2017
Sounds ridiculous maybe, but have you by any chance tried braking hard, at lower speed on a gravel road, just to see if you can pick up on which wheel is grabbing first. I recall a rear wheel cylinder partially seized with slight leak on rear of one of my vehicles, causing front end to whip over on braking. Only after hitting them hard at slower speed on gravel road, was I able to pick up on it.
Posted on Feb 19, 2009
have one person in the blazer pumping the brake pedal and then hold to the floor, crack the bleeder then tighten, release pedal, repeat till all air is out one side at a time, if this does not work then your ABS unit is bad witch if u follow your lines from your master cylinder u will find a black box with a motor on it, or the master cylinder itself is bad, it also can cause u to have no pedal, replace the master cylinder first, most likely cheaper.
Posted on Mar 11, 2009
1. Raise and support vehicle, then remove wheel/tire assembly.
Posted on Jun 04, 2009
There's a special tool required to compress the rear caliper pistons. You may want to rent the tool. If you look at the piston you'll see one or two notches. The special tool has nipples to fit these notches. The caliper piston will have to be compressed with the tool and the notches will have to be placed in the o'clock and 6 o'clock for the brake pads to slide over the rotor. If you rent the special tool have the renter show you how to use it.
Posted on Sep 15, 2010
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