Brakes
#7
The brake booster is vacuum actuated, so a leak could be the problem.
If you have a vacuum leak, your engine will be idling high even after it's warmed up (over 1500 rpm) so that should give you a clue.
If your brake's master cylinder is full, and you DO have brakes when you mash down on the pedal, (not pump) Best guess is the booster is gone.
It's only about $50 at the JY.
Carpe *******
If you have a vacuum leak, your engine will be idling high even after it's warmed up (over 1500 rpm) so that should give you a clue.
If your brake's master cylinder is full, and you DO have brakes when you mash down on the pedal, (not pump) Best guess is the booster is gone.
It's only about $50 at the JY.
Carpe *******
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#9
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 31
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
pump brake pedal untill it get hard then start xj pedal should drop a little this will indicate brake booster is working properly .
#14
An 89 doesn't have ABS
Sounds like you have a vacuum leak.
If you can't spot it with a visual inspection, get a propane torch like you'd use for plumbing.
Turn it on without lighting it.
Use the torch to spray the propane gas on the vac. lines and fittings.
When you come to the leak, the engine idle will jump up because the engine is sucking propane.
Sounds like you have a vacuum leak.
If you can't spot it with a visual inspection, get a propane torch like you'd use for plumbing.
Turn it on without lighting it.
Use the torch to spray the propane gas on the vac. lines and fittings.
When you come to the leak, the engine idle will jump up because the engine is sucking propane.
#15
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 31
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Heres all info i ever found on it alot of people trash it and up grade to dual diaphragm booster ...http://www.aa1car.com/library/abs_bendix9.htm