Brakes

[ktraver97ss]

So I pulled into my dads driveway the other day in my truck, and as i barely started to apply the brakes the pedal starts pulsating like the abs is going on. Which doesnt make sense since I was doing like 3-5 mph. I realized i was not slowing so I mashed the pedal and it just pushed back like the abs does. The calipers also failed to compress and grab the rotors so my 7000# truck coasted up the driveway and into the brick corner of the house next to the garage. Knocked about a 6 foot tall by 3 ft wide section of brick loose (dad was happy about that), but only a small dent in my bumper. Got to love steel.

Still dont know whats wrong with it, had a mechanic friend take it last night, but he could not get it to do it again. It did not set off the check engine or abs lights either.

Any ideas?

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[Lord Tin Foilhat]

thats odd..... i havent any idea... i sat here for 20 mins thinking wtf could do that. and whats realllllly odd is it only happened once

 

[Dasfinc]

random bit of air in the brake lines? Crossed/grounded ABS wire?

 

[CamaroSS]

air in the lines is my best guess also..... beyond that, dont know, thats pretty random

 

[PANDA]

Damn, its not a Ford, so I dont know.

 

[SRT41320]

thats wierd - my old 2000 silverado did that in a bestbuy parking lot a few years ago and it blew a front brake line - replaced the line - bled the air - never had the problem after - it was so wierd

 

[Burtonrider10022]

random bit of air in the brake lines? Crossed/grounded ABS wire?

no, cause ABS would ave applied itself...

James

 

[DarkShadow]

failing abs sensor...? my alero does something similar for the first stop after startup until the abs system faults and trips all the warning lights cuz of a bad wheel speed sensor up front...

 

[Burtonrider10022]

but the brakes still would have worked? debris in your Brake fluid? low fluid levels at all?

 

[DarkShadow]

but the brakes still would have worked? debris in your Brake fluid? low fluid levels at all?

if the abs thinks theres a massive lockup it can cause a no brakes situation. because when it kicks on it takes over its gonna try to stop that whee from locking up which in turn reduces pressure to the other wheels too if the computer is confused.... im tellin ya, if my abs light doesnt come on pulling out of my driveway in my alero i usually have to coast thru the stop sign at the end of my block before it faults....

 

[SaturdaysGS]

I also vote failing wheel speed sensor. Can be pretty dangerous, as you can tell.

 

[Burtonrider10022]

brakes are for pussys

 

[Bob Kazamakis]

I also vote failing wheel speed sensor. Can be pretty dangerous, as you can tell.

i triple that vote. is it a GM? i bet the wheel speed sensor is in your wheel hub and its going bad. check for grinding noises or just replace them for good measure.

 

[WhiteDevil]

its teh sensor, disconnect the ABS and it wont happen again.

 

[ktraver97ss]

yep, it was the wheel speed sensor in the hub. I replaced the other side last year cause it was makeing the grinding noise. This one has been quiet, but I guess i should have done both.