need some sdvice bleeding brakes

S

stardust

NAXJA Forum User

Location

Lloydminster,SK

• May 10, 2015

• #1

Hello
I just switched out my abs system to a vacuum system (abs motor died) and now I can't seem to get brakes back. I have bled the brakes about 6 or 7 times at least and still have very mushy brakes. Is there something I'm overlooking or something else I can try? I put on a new master cylinder and bled that before the rest of the system.
Thanks for any advice.

 

Hypoid

NAXJA Member

NAXJA Member

Location

Golden, CO

• May 10, 2015

• #2

What year Jeep, or what ABS system?

 

S

stardust

NAXJA Forum User

Location

Lloydminster,SK

• May 10, 2015

• #3

90 cherokee and not sure what ABS

 

Hypoid

NAXJA Member

NAXJA Member

Location

Golden, CO

• May 10, 2015

• #4

That would make it the Bendix 9 ABS, I don't miss it.

One thing I have had to do was replace the wheel cylinders in the drum brakes. They are different diameters between the ABS and non-ABS systems.

What year vacuum booster did you install?

 

S

stardust

NAXJA Forum User

Location

Lloydminster,SK

• May 10, 2015

• #5

I believe that the booster was from an 88 cherokee. At least that's what the wrecker told me.

 

Hypoid

NAXJA Member

NAXJA Member

Location

Golden, CO

• May 10, 2015

• #6

If you got the respective proportioning valve, changing the wheel cylinders should get your pedal back.

 

S

stardust

NAXJA Forum User

Location

Lloydminster,SK

• May 10, 2015

• #7

I got the proportioning valve with the system I picked up. Would putting the old valve back on work? Also, why are all the brakes soft?

 

Hypoid

NAXJA Member

NAXJA Member

Location

Golden, CO

• May 10, 2015

• #8

Keep the proportioning valve that came with the booster and master cylinder, they are designed and sized to work together. The only other part that is out of spec for your brake system is the rear wheel cylinders.

I helped a buddy do the same conversion to his XJ, and he did the same to two more XJs. All had the same problem mine did, until he thought to change the rear wheel cylinders.

 

S

stardust

NAXJA Forum User

Location

Lloydminster,SK

• May 10, 2015

• #9

OK thanks. I'll give that a try. Don't have anything to lose by trying that, and gaining the brakes back would be great. Thanks again.

 

T

Tobey99

NAXJA Forum User

Location

Houston

• May 11, 2015

• #10

Did you let the master cylinder run dry? If so, did you bench bleed it? If not, do that before anything else. Otherwise, you'll never get the air out of the MC. You can bench bleed with it installed; I actually think it's easier that way. And if you're not familiar with bench bleeding, just Google it.