Odd brake situation

rparker762 · Oct 23, 2022

So, I have a 2013 Ram 4x4 Laramie crew cab. Twice now, I've bumped a curb with the rear passenger tire and then temporarily lost brake pressure. The first time, the brake light came on and the pedal would go all the way to the floor. After about 5 minutes, the brake started working. Dealership said they could find nothing wrong. Second time was yesterday and only had soft brakes for about 5 seconds and everything started working again. Anyone else experience something like this? I'm at a loss. And there are no leaks either.

1979PowerWagon360 · Oct 23, 2022

That's odd. Collapsing hose? Actually that's describing a bad master cylinder but I can't think of what bumping the curb would have to do with it, so that's why I mentioned the hose at that wheel.

csuder99 · Oct 23, 2022

Check for axial movement of the axle shaft or something similar that increases the gap between the pads and the rotor.

Jeepwalker · Oct 23, 2022

More detailed info needed:
When you say 'bump' the curb, you mean, you scrubbed against it, like during parking? Or you were doing a doughnut, lost control, and smacked the rear tire into the curb sideways?

And in that 5 minutes where you lost brakes, did you pump it several times? What did you do to get the brakes back? Or you pumped the pedal many times, nothing happened, and after 5 minutes the brakes suddenly came back out of the blue? I'm just trying to get more info because that does sound strange...

800steve · Oct 24, 2022

Bad wheel bearing.

rparker762 · Oct 24, 2022

Basically I turned too soon and the back tire went over the curb and dropped off. Like if you have no choice but to drive off a curb... that kind of hit. And no it's not a bad wheel bearing. The brake pedal goes soft. The first time I had to pump the brakes twice to get pressure back, took to dealership and they checked everything and could find nothing wrong. Second time, the pedal went soft but the brakes came right back. Only done it when it's the rear passenger side that drops, hits, whatever.

18CrewDually · Oct 24, 2022

Maybe an ABS valve issue. The tire is catching air and the ABS module senses the rear axle speed change in comparison to the front wheels and is cycling the valves/pump. That's my theory without looking at it in person. A good scan tool you can graph and monitor the actuation and speed sensors readings to verify.

Nicholas Cove · Oct 26, 2022

You probably bumped the piston back a little in the caliper. Couple of pumps and you have your pedal back...

Odd brake situation

rparker762

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1979PowerWagon360

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csuder99

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Jeepwalker

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800steve

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rparker762

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18CrewDually

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Nicholas Cove

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