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Brakes


 
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OnAll4s
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Joined: 25 Apr 2007
Location: Seattle (actually Renton), WA

PostPosted: Thu Apr 26, 2007 9:49 am    Post subject: Brakes Reply with quote

I must've gone for almost two years now with my CHECK ABS light on. I neglected to have the ABS fixed as my mechanic told me it could be $1500+ to replace my ABS control module. Well, I went in the other day for a brake job, and had the two front calipers replaced. And guess what? My ABS works once again! Shocked Very Happy

Anyway, my question here is: Braking works fine (as it should) but while at stop lights, with foot on brake pedal, after a few seconds, my brake pedal will start to go a little closer to the floor. Is this normal?

Obviously, it's been a while that I've had that ABS feeling, that's the reason I ask.

Thanks,

Fred
93 ZJ Laredo 4.0
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5.9 andy
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Joined: 15 Feb 2007

PostPosted: Thu Apr 26, 2007 12:31 pm    Post subject: Reply with quote

hey at what speed u have to be going to make ur ABS pulse when u stomp on the break? i have stomped on my break pedal going 60 and it didnt pulse a bit, they didnt lock up so it didnt need to kick in, but it would be nice to know what the usual speed is that they activate.
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OnAll4s
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Joined: 25 Apr 2007
Location: Seattle (actually Renton), WA

PostPosted: Thu Apr 26, 2007 1:58 pm    Post subject: Reply with quote

5.9 andy wrote:
hey at what speed u have to be going to make ur ABS pulse when u stomp on the break? i have stomped on my break pedal going 60 and it didnt pulse a bit, they didnt lock up so it didnt need to kick in, but it would be nice to know what the usual speed is that they activate.


As long as you have good traction there's no need for ABS to kick in. You should feel the pulsing under almost ANY kind of hard braking over wet pavement, or even manhole covers.
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cajzmere
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Joined: 19 Jul 2005
Location: Rochester, NY AKA NY Tundra.

PostPosted: Thu Apr 26, 2007 6:22 pm    Post subject: Reply with quote

Yeah, that pedal feel is normal. The brake booster will "give" with a steady foot after about 30 sec. If it feels "squishy", when stopping it could be air and need to be bled.
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cajzmere
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Joined: 19 Jul 2005
Location: Rochester, NY AKA NY Tundra.

PostPosted: Thu Apr 26, 2007 6:26 pm    Post subject: Reply with quote

5.9, ABS activation isn't a speed thing, it's a wheel slippage thing.
http://auto.howstuffworks.com/anti-lock-brake.htm
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OnAll4s
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Joined: 25 Apr 2007
Location: Seattle (actually Renton), WA

PostPosted: Fri Apr 27, 2007 6:41 am    Post subject: Reply with quote

cajzmere wrote:
Yeah, that pedal feel is normal. The brake booster will "give" with a steady foot after about 30 sec. If it feels "squishy", when stopping it could be air and need to be bled.


I was wondering if it might be a bleeding issue, but no, I don't feel any squish. This is certainly the 30 sec. "give" that you describe.

thanks.
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cajzmere
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Joined: 19 Jul 2005
Location: Rochester, NY AKA NY Tundra.

PostPosted: Fri Apr 27, 2007 3:55 pm    Post subject: Reply with quote

I should clarify. If you sink a little bit and stay there it's OK, if it goes way down, there's an issue. To test your brakes... Turn engine off, apply pedal and hold down. Should sink slowly. Still with engine off...pump up brakes and hold pedal, should stay firm. While holding, start engine. Pedal should sink slowly to a normal (when driving) position. This will test your master cylinder and your brake booster.
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5.9 andy
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Joined: 15 Feb 2007

PostPosted: Fri Apr 27, 2007 7:03 pm    Post subject: Reply with quote

i just bled my brakes 5 days ago. just so u know.
and i installed new pads.
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cajzmere
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Joined: 19 Jul 2005
Location: Rochester, NY AKA NY Tundra.

PostPosted: Sat Apr 28, 2007 5:33 pm    Post subject: Reply with quote

5.9 andy wrote:
i just bled my brakes 5 days ago. just so u know.
and i installed new pads.


I think I missed something, did you have another question about your brakes? Rolling Eyes
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