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'93 940 (165K miles) Brake-related Pulsation? 900

posted by  spook on  Sun Feb 23 17:27 CST 2020
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear Fellow Brickboarders,

Hope you're well. After inspecting all four wheel brakes and correcting a stuck caliper pin, I still can't end a slow, rhythmic "whump-whump" when braking.

This is not likely drive-shaft related: the noise's frequency does not increase with speed. The drive-shaft center support seems to be in good order: there's no play.

Noise frequency does increase with brake pedal pressure. The car does stop, but more pedal pressure is required to get that done, than used to be so.

The ABS warning light stays-off after start-up. The steering wheel does not "twitch" when this noise is present.

A car-smart neighbor opined, having been a passenger for a test drive, that the noise comes from the rear.

Could the brake booster be the source of this worrisome noise?

Thanks for the benefits of your insights!

Yours faithfully,

Spook






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