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Old 08-25-2012, 11:16 PM   #1
MilesToGo
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Braking Issue

Hey folks,
So I bought my 2003 ZX3 a few months ago, and ever since it has been suffering from an issue with the brakes. The car drives fine going down the road, but when the brakes are applied there is a fairly violent pulsating shake that increases with greater pedal pressure and also varies according to how fast I'm driving. As the car comes to a stop, it feels as though I am pumping the brake pedal slightly, that sort of pulse if that makes any sense. Also the ABS is not working at this time either. So I'm just not sure how to attack this issue as far as what is causing the problem, perhaps a warped rotor or a wheel bearing, idk. Thought I'd throw this out there to anyone with a similar issue or who knows what needs to be fixed.

Thanks


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Old 08-25-2012, 11:24 PM   #2
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warped rotors most likely.
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Old 08-25-2012, 11:29 PM   #3
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I'm assuming the pads have adequate friction material on them and are not worn out (check visually). Do you know if they are the original rotors and how many miles are on them? In addition to the rotor run-out and wheel bearings (both valid considerations) also check the tie rod ends for any play. Pulsating brakes is more often attributted to poor quality metallurgy (a cheap poorly made rotor) which leads to poor bedding of pad material.
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Old 08-28-2012, 02:44 PM   #4
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Quote:
Originally Posted by Geezer View Post
Pulsating brakes is more often attributted to poor quality metallurgy (a cheap poorly made rotor) which leads to poor bedding of pad material.
Perfect answer, usually a "warped" rotor is the feeling of the pad gripping part of the rotor harder then another giving you that plusating feeling. Not bedding the new pads and rotors correctly could cause this. You can also do this if you are using the brakes hard like if you do any auto crossing, causing them to heat up, then when you park you set you E-brake. You're just letting the brakes create an extra thick "film" on that spot of the rotor so when you brake at speed, the pad wants to grip harder there.


THIS is a good link with proper bed-in process for new brakes FYI...
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Old 08-28-2012, 06:33 PM   #5
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Thanks for the great advice guys. I'll definitly be looking into the warped rotor issue. I'll be posting the results once I get it addressed.
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Old 08-28-2012, 06:45 PM   #6
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do u feel it in the pedal or does the steering wheel shake? if its just in the pedal its probably your drums being out of round in the back, if u feel it in the steering wheel its the front rotors being warped (like they said) i'd recommend new pads+rotors
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Old 11-21-2012, 10:22 AM   #7
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Here is a in depth article from a professional magzine publisher.
http://www.counterman.com/Article/95..._the_pads.aspx
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