Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here XJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.

Brakes

Thread Tools
 
Search this Thread
 
Old 09-26-2012 | 06:02 PM
  #1  
morgan320i's Avatar
Thread Starter
Member
 
Joined: Sep 2012
Posts: 185
Likes: 1
Model: Cherokee
Default Brakes

i have no brakes on my 89 xj, i dont feel anyxpressure when i start the truck, any tips, i looked for a vacuum line but saw nothing this 89 has like 10 lines going to it
Old 09-26-2012 | 06:28 PM
  #2  
freegdr's Avatar
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
Default

when you push pedal it goes to floor ?
Old 09-26-2012 | 06:36 PM
  #3  
morgan320i's Avatar
Thread Starter
Member
 
Joined: Sep 2012
Posts: 185
Likes: 1
Model: Cherokee
Default

I have brakes but feel 0 assist when engine is on, have to slam on the brakes to slow down
Old 09-26-2012 | 06:37 PM
  #4  
freegdr's Avatar
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
Default

so pedals hard a rock when pushed?
Old 09-26-2012 | 06:46 PM
  #5  
morgan320i's Avatar
Thread Starter
Member
 
Joined: Sep 2012
Posts: 185
Likes: 1
Model: Cherokee
Default

Pretty mucH
Old 09-26-2012 | 06:52 PM
  #6  
Parsnip's Avatar
CF Veteran
 
Joined: Dec 2011
Posts: 1,050
Likes: 2
From: Roanoke, VA
Year: 1990
Model: Cherokee
Engine: 4.0
Default

Bleed your breaks and try.new hardlines
Old 09-26-2012 | 07:23 PM
  #7  
Marcucco's Avatar
Member
 
Joined: Apr 2012
Posts: 212
Likes: 1
From: ri
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Default

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 *******
Old 09-26-2012 | 07:35 PM
  #8  
morgan320i's Avatar
Thread Starter
Member
 
Joined: Sep 2012
Posts: 185
Likes: 1
Model: Cherokee
Default

Engine does idle high after warm which line is it? Not easy to spot like most cars , its an 89
Old 09-26-2012 | 07:37 PM
  #9  
freegdr's Avatar
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
Default

pump brake pedal untill it get hard then start xj pedal should drop a little this will indicate brake booster is working properly .
Old 09-26-2012 | 07:43 PM
  #10  
freegdr's Avatar
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
Default

this is the brake booster vacuum line ...
Attached Images  
Old 09-26-2012 | 07:44 PM
  #11  
morgan320i's Avatar
Thread Starter
Member
 
Joined: Sep 2012
Posts: 185
Likes: 1
Model: Cherokee
Default

my xj is not like that
Old 09-26-2012 | 07:44 PM
  #12  
morgan320i's Avatar
Thread Starter
Member
 
Joined: Sep 2012
Posts: 185
Likes: 1
Model: Cherokee
Default

could my abs pump be bad?
Old 09-26-2012 | 07:47 PM
  #13  
freegdr's Avatar
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
Default

you have abs thats completly different set up .
Old 09-26-2012 | 07:52 PM
  #14  
Marcucco's Avatar
Member
 
Joined: Apr 2012
Posts: 212
Likes: 1
From: ri
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Default

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.
Old 09-26-2012 | 07:52 PM
  #15  
freegdr's Avatar
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
Default

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



All times are GMT -5. The time now is 04:21 AM.