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jback 11-17-2012 09:35 AM

98 Impreza brakes
Have 98 Impreza Outbackwith 208k; I have replaced front calipers & pads, but brakes have an irregular grabbing with a sensation through the pedal and slight thump or twang. Is this something with the ABS or related and how do I find out.

Osei 11-17-2012 03:55 PM

Did you remove sliding pins and regrease them?
What condition are rotors in? Did you check their thickness? The minimum SB stamped on the back of the rotor itself.
BTW, how long ago was your t belt etc done?


PeterJMC 11-17-2012 04:12 PM

^ +1 for you to check all of what Osei posted.

In addition to that, you should flush your brake fluid if it hasn't been done in the past year or two.

To check if it's the ABS, you should pull the ABS fuse and see if it still acts up. Pulling the ABS fuse will disable the component until you put the fuses back in.

jback 11-22-2012 08:47 AM

Thanks for your responses. I have ck'd and greased the sliding pins, the rotors look in in good shape and I am unable to find any numbers on them.
I have test driven with the 20amp ABS fuse removed and everything seems normal. with the fuse replaced the brakes make this grab and release sensation. I cannot remove the ABS controller fuse as it will not shift with that one out. How do I determine is this the (Hydraulic control unit, Proportioning valve or what.
The timing belt,water pump and tensioners were done at 170k

Osei 11-22-2012 09:46 AM

Had similar issues with a 98 Forester.
The "mechanic" who replaced a ball joint, broke the tone ring on daughter's car. Had to remove fuse as you did to stop the grabbing etc. Until there is a reason to remove hub (very unlikely), it will stay like that.
Check for broken tone rings on each wheel.


jback 12-05-2012 07:35 AM

Thanks for another suggestion. I checked and cleaned the front tone rings(circular bracket that holds the lug bolts?) they are all in good condition. Where do I look now?

PeterJMC 12-05-2012 07:45 AM

Do the '98s have wheel speed sensors? Check your wheel speed sensors?

Inspect the wiring to ensure they are in tact. I'm not sure how to test each sensor to verify if they are actually functioning though.

Osei 12-05-2012 03:31 PM

PM me your e mail and I will send you the FSM.
From what I see, the LF and RR are on one line and the RF and LR on the other.
Check your rears, you may have something loose in there.
Rotor minimum thickness is 22mm for either 15 or 14 in wheels. Rear drum min. inside dia. is 230.6mm


jback 12-15-2012 01:06 PM

I have ck'd the front wheel sensors(the space between is a bit more than max .055 in) but
the electrical appears within .8 + 1.2 k ohms at the connector. Is there any other way to diagnose this problem.

Osei 12-15-2012 04:30 PM

i would join and post over on USMB (UltimateSubaruMessageBoard). There are at least 4 mechanics over there.
Perhaps you will get more leads there.
Unfortunately I am at the end of my knowledge here.


jback 12-27-2012 06:49 AM

With the ABS diagnostic terminal grounded with (B81 grounds) I get a variety of codes through the OBD. PO500 speed sensor A and 1540 speed sensor 2 PO130. So which is speed sensor A or 2 ? I guess PO130 is the oxygen sensor or a leak

Osei 12-29-2012 12:01 PM

Sent you a copy of DTC via e mail.
Hope this helps.


Zombaru 01-13-2013 12:33 PM

I had a similar situation in my '00 when ever i hit a bump. It was caused by a recently blown strut. So when the wheel hit a bump while i was braking it bounced, loosing traction and causing the ABS to push back on the pedal.

dammed lousy cheap infrastructure :spin:

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