98 Subaru OBS Brakes won't bleed - Car Troubleshooting


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98 Subaru OBS Brakes won't bleed

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cplante
New User

Jun 11, 2009, 7:17 AM

Post #1 of 4 (5756 views)

98 Subaru OBS Brakes won't bleed	Sign In

The car is a 1998 Subaru Outback Sport with a 2.2. The brake lines were rusted through so i had to replace them. But when I tried to bleed the air out of the system i can't get a pedal. I've tried bleeding the conventional way (pump the brakes and crack the bleeder), and with a mityvac pump. I also bled the master cylinder. I've checked the entire system and there are no leaks anywhere. I need to know if there's a special way to bleed these brakes, the car has ABS. The order i bled was master cylinder, RF, LR, LF, RR. Any advice is greatly appreciated.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jun 11, 2009, 3:27 PM

Post #2 of 4 (5749 views)

Re: 98 Subaru OBS Brakes won't bleed	Sign In

cplante; This calls for an unusual bleeding procedure, I must admit. RF, LR, LF, RR. Open each bleeder, individually, and let it gravity bleed until no air is present. Don't move on to the second wheel until you are certain that the first is done. Then, the third, ect. You want to be especially careful not to depress the brake pedal all the way to the floor during the bleeding process. You can rupture the master cylinder if you do. Good luck.
Loren
SW Washington

cplante
New User

Jun 13, 2009, 8:04 AM

Post #3 of 4 (5742 views)

Re: 98 Subaru OBS Brakes won't bleed	Sign In

I had to replace master cylinder and your bleeding procedure worked. Now i have a good pedal, but I have to push extremely hard and can't stop well. I'm hoping it's not my brake power booster but i'd like some insight. Any ideas?

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Jun 14, 2009, 8:50 AM

Post #4 of 4 (5737 views)

Re: 98 Subaru OBS Brakes won't bleed	Sign In

cplante; Thanks for the reply. Glad to hear that you've at least have a pedal, now. Assuming that this does have power assist brakes? Make sure that you've got a good vacuum signal going to the power booster. If the engine isn't running good, the vacuum may be low, causing the 'hard' pedal. Listen for any vacuum leaks up, under, the dash. With the engine running, press on the brake pedal and listen again. Make sure that all of the brakes are releasing, too.
Does this get worse the farther you drive?
Loren
SW Washington

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