Pulsing brake pedal
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#3
Join Date: Mar 2014
Location: Tehama County, California, USA
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In Alberta in January/February, maybe you got your brakes Really hot in a sort of panic stop, and then they immediately got wet from icy water. That would certainly warp a rotor. That would give you a pulsating pedal.
If it's bad enough it can't be machined out you need a new rotor.
(';')
If it's bad enough it can't be machined out you need a new rotor.
(';')
#4
Join Date: Mar 2015
Location: Dural, Northwest Sydney. Australia.
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#5
Hi ChuckR,
Pulsing brake pedal has always proved to be warped rotors in my experience.
After a heavy application of brakes you really need to get the brake pads off the rotor surface (ie. take your foot off the brake pedal) as the two hot surfaces can create a hot spot and subsequent warping.
It's not intuitive and it is difficult to do in traffic.
Dabbing the brakes and releasing them as long as there is no one or anything in front of you works.
If you have to remain stationary, pulling the handbrake on and releasing the foot brake also works, assuming you are on level ground. This transfers the braking from front to rear. Just don't drive off with the handbrake still on. That creates other problems.
Just my two bobs worth.
Good luck,
Nigel
Pulsing brake pedal has always proved to be warped rotors in my experience.
After a heavy application of brakes you really need to get the brake pads off the rotor surface (ie. take your foot off the brake pedal) as the two hot surfaces can create a hot spot and subsequent warping.
It's not intuitive and it is difficult to do in traffic.
Dabbing the brakes and releasing them as long as there is no one or anything in front of you works.
If you have to remain stationary, pulling the handbrake on and releasing the foot brake also works, assuming you are on level ground. This transfers the braking from front to rear. Just don't drive off with the handbrake still on. That creates other problems.
Just my two bobs worth.
Good luck,
Nigel
#6
Join Date: Oct 2009
Location: Perth Ontario Canada
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Most cases of warpage as referenced above is not actual distortion of the rotor itself, but spots of brake pad material (binding agents) that have transferred from the pad to the friction surface of the rotor. This creates a high spot that feels like a pulsing through the pedal or causes the steering wheel to shake during braking.
Although the rotor can be machined to remove the material, this heavy handed action results in a thinner rotor with a reduced service life.
Any decent mechanic will simply remove the spots of pad material with an abrasive wheel made for the purpose.
Although the rotor can be machined to remove the material, this heavy handed action results in a thinner rotor with a reduced service life.
Any decent mechanic will simply remove the spots of pad material with an abrasive wheel made for the purpose.
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littlelic69 (02-03-2016)
#7
Thanks all for the comments, yes warped front Rotors was the problem which was only noticeable once Rotors warmed up. The brakes were all original from 1987 so Had the front rotors replaced, new pads all round, repack bearings, new fluid, etc. just before drive home to Comox BC. Paid dividends during panic stop North of Kansas City. Need service when in central Florida? go to All Jaguar in Longwood North of Orlando.
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LnrB (04-03-2016)
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