So I just got done with a full brake job on my girlfriend's '07 3s. Rotors and bendix pads. Flushed the brake fluid. For each caliper, I opened the bleeder on when I retracted the piston so I wouldn't push junk into the ABS pump. Then I did a normal bleed (gf pumped the pedal and held, then I opened and closed the bleeder). After it was done i have 2 issues.
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left front squeals, very loudly. If it was my car, so what. But my gf wants a quiet car. Lubed everything and put the anti-squeal/rattle springs back in place.
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Hard stops do not trigger ABS. I did a couple of panic stops to make sure ABS engaged. It didn't. No lockup or ABS. It didn't feel like it was stopping hard. No warning lights.
Ideas?
Thanks!
No clue on the squeals but if it doesn't lockup, then there is no reason for ABS to engage. ABS doesn't engage for hard stops, it engages for lockup.
Either your brakes weren't strong enough (AKA you have too much tire or not enough brake), you didn't push them hard enough, or ABS was working and you didn't feel it.
Did you break in the pads?
You don't have to open the bleeders to compress the calipers
Does the T/C still operate normally? (tied in with ABS system)
New pads and rotors need to be bedded in before they work properly. A few good hard stops from highway speeds should do it.
Yes, brakes were bedded. thats when I was discovering that the ABS was not triggering. I did a few hard stops, let them cool, then did two full pedal stops. I've had a 3 before so I know you can hear the ABS.
I know you don' thave to open the bleeders, however, I don't want old fluid going backwards through the ABS pump, potentially carrying debris with it (fluid looked clear however). I'm going to re-bleed this afternoon.
take it to a dirt lot and stand on the brakes, that ought to tell you if the ABS isn't engaging.
Sounds like it could be a stuck piston in the caliper but the ABS not engaging at all seems weird. It still should engage for the other wheels even if the piston is stuck in one position. That would cause a squealing and no ABS on that corner but ABS should still work if not earlier with screwed up side to side balance on that axle. I would try WilberM3's idea and then check for a seized piston or caliper not sliding properly and re-bleed while the car is up.
All calipers were in very good condition. Nothing stuck, all sliders were corrosion free and re-lubed. I will try a dirty lot too. Thanks for all the ideas. Keep 'em coming!
I too open the bleeder.
The ABS won't activate unless a wheel starts to slide.
Do like wilber said. Or apply the brakes while making a sharp turn.
OK, I borrowed my friend's pressure bleeder. That did the trick. Got a bit of air out of the right side calipers. ABS works as expected in dry and on gravel. Pedal is much harder now too.
Thanks everyone!
