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Old 05-18-2017, 02:06 PM   #1
footfootfoot
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Seems OK to me.


New question:

The car has sat for a couple of months, when I started to drive it the brakes were pulsing like mad, as though one of the rotors was a potato chip. It was fine before it parked it, and the rotors have fewer than 1000 miles on them.

I'm gonna check for sticky calipers and or broken pads. Any other ideas?
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Old 05-18-2017, 02:16 PM   #2
glatt
 
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I could speculate, but pulling the offending wheel off and looking at things will tell you a hell of a lot more than I can speculate about.

Unusually rusty rotor?

I got nothin'...
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Old 05-18-2017, 02:50 PM   #3
Gravdigr
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Quote:
Originally Posted by footfootfoot View Post
I'm gonna check for sticky calipers and or broken pads. Any other ideas?
Could be the caliper isn't sliding on the pin/bolt like it should. Due to rust, perhaps.
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Old 05-18-2017, 02:53 PM   #4
Gravdigr
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Quote:
Originally Posted by footfootfoot View Post
...brakes were pulsing like mad...
Were you feeling this through the brake pedal? Like when your anti-lock brakes kick in and push back on the pedal? That might mean anti-lock issues...Still not the end of the world.
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Old 05-18-2017, 04:58 PM   #5
xoxoxoBruce
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I vote rust likely and should be eliminated first. If you're also feeling it through the wheel then it's the front. If not it could be either.
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Old 05-18-2017, 07:03 PM   #6
tw
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Quote:
Originally Posted by footfootfoot View Post
The car has sat for a couple of months, when I started to drive it the brakes were pulsing like mad, as though one of the rotors was a potato chip.
Any car that sits outside for a month (exposed to rain) will have rust on its rotors - except where a brake pad protected it. It will take time for rust to wear off. And then that rotor will be same dimension all around - no more pulsing.

Highway speeds are unnecessary. Best is an open road (no traffic) and do much light braking. Best that way so that rust does not embed into brake pads.

Should a car sit for over a month, best is to cover all disc brake wheels with a garbage bag. Keep rain out.
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