brake help
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Senior User
Joined: Apr 2005
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brake help
I installed a junkyard booster/MC on my f100, had to switch the brake lines to the left side of the MC though. I hooked up the front brakes only, because I have to get a adaptor fitting for the rear, filled it up with fluid and turned on the truck. When I pressed the brake down it had a rough idle, but was VERY easy to push down. The gromet on the booster has some play in it too. I tried to bleed the front brakes and did get a solid line, but a very weak one, and I still had no brakes. One thing I did not do was bench bleed the MC. Is this a bad booster?
Postmaster
Joined: Jul 2005
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Should bleed the brake master cylinder first, and requires a bench bleed ( bleeding the brake master cylinder of the truck).
I did the same swap you mentioned and I used a brake line adapter on the rear brake line facing the brake power booster, flared out the brake line. The grommet on the brake power booster should not leak any vacuum. Will need to bleed out the complete brake system after a bench bleed. Start at the passenger rear brake cylinder (RR), the the left rear brake cylinder, then the passenger right front disc brake caliper, and the driver left disc brake caliper when bleeding out the air from the brake system.
While the master cylinder is off check the tolerance of the power brake booster rod https://www.ford-trucks.com/user_gal...=94721&width=0
----- buck ------
I did the same swap you mentioned and I used a brake line adapter on the rear brake line facing the brake power booster, flared out the brake line. The grommet on the brake power booster should not leak any vacuum. Will need to bleed out the complete brake system after a bench bleed. Start at the passenger rear brake cylinder (RR), the the left rear brake cylinder, then the passenger right front disc brake caliper, and the driver left disc brake caliper when bleeding out the air from the brake system.
While the master cylinder is off check the tolerance of the power brake booster rod https://www.ford-trucks.com/user_gal...=94721&width=0
----- buck ------
Thread Starter
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Senior User
Joined: Apr 2005
Posts: 208
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I know where and how to bleed but Im just wondering if my booster is bad? or what is causing all of this. I know that a bad booster will create a hard pedal, but mine is the exact opposite, so im stumped. btw... im running 4 wheel drums.
