Postofficemike
New member
Do I need to replace the brake booster if, when I press the brake pedal, it goes almost to the floor, but if I pump it 3 or 4 times it builds up? Not good for a quick stop if someone pulls out in front of me.
Brake Booster for 89 YJ Wrangler
- Thread starter Postofficemike
- Start date
That is normally a sign of air in the brake lines. Try bleeding your breaks and see if that helps.
Oneeyedjake
New member
I agree with Terry. Try bleeding the brakes.
Postofficemike
New member
I did try to bleed the brakes, but it didn't help. Would the booster be the next thing to replace? Is there a way to test the booster? Also, has anyone used the "Speed Bleeders" for bleeding the brakes? It looks too good to be true.
superj
Well-known member
usually, a booster being bad will make a hard pedal or your idle will raise when you push the brake pedal. a spongy pedal is normally air in the brake lines, especially with your description
google testing a brake booster and it will pop up exactly how to test yours.
are you asking about the speed bleeder little things that go on your calipers? i have on my bmw. they worked fine for me
google testing a brake booster and it will pop up exactly how to test yours.
are you asking about the speed bleeder little things that go on your calipers? i have on my bmw. they worked fine for me
jfrabat
New member
You could also have a small leak somewhere in the system. My rear drums had a small leak, and it really affected my braking performance, as the pressure would "escape" through the leak. If you DO decide to change the booster, I would recommend trying to make the 95.5 model fit (you'll need the master as well), as it is a double diaphragm design, but, to be honest, I doubt this is your issue. And if tried bleeding, try raising the front of the Jeep and turning the wheel from one side to the other with the Jeep off a couple of times; sometimes bubbles get trapped and are hard to get out.
My suggestion would be to park on some clean concrete and pump your brakes for a while, then crawl under your Jeep and look at each wheel's brakes for fluid. You may need to come back the next morning and look again.
Do you need to add fluid in your master cylinder periodically?
Do you need to add fluid in your master cylinder periodically?
Postofficemike
New member
No. That is what is confusing. There is no drop in fluid level. No wet spots around any of the bleeder valves. No leaks from fittings. What I noticed today is that if I pump the brakes I can hear an air sound from under the brake pedal area. Do you think some part of the booster is leaking from the back? Thanks.
Postofficemike
New member
I hate to show my limited knowledge, but you guys seem to know your stuff and I guess I'll not learn unless I ask. Do I have to jack up the Jeep to bleed the brakes? I can get under because of the height, easily. Thanks.
Postofficemike
New member
Thanks a lot for all the advice. Will try these things tomorrow and will post which one it was.
Postofficemike
New member
i decided to bleed the brakes again and that seems to work this time, so thanks again for all the replies.
