Brake / ABS Lights

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Apr 12, 2017 | 12:12 PM

62FE4x4

Thread Starter

Tuned

Joined: Jul 2011

Posts: 470

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Brake / ABS Lights

Any idea what would cause the brake indicator and ABS light to come on whenever you hit the brake pedal? The come on simultaneously. Thanks any opinions welcome

Apr 12, 2017 | 12:16 PM

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

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From: Madison, WI

Yeah, it means your brakes may fail at any time. Have you checked the brake fluid, and checked the wheels and ALL lines for leaks?

Apr 12, 2017 | 12:24 PM

62FE4x4

Thread Starter

Tuned

Joined: Jul 2011

Posts: 470

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Absolutely. No fluid leaks; reservoir is full. Brake light sensor on the master cylinder is new, and the abs sensor is new as well.

Apr 12, 2017 | 04:16 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

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From: Kentucky

The Red Brake light is triggered by low fluid in the master cylinder. You may have a bad float inside the master cylinder if it really is full.

For reference (lower right hand corner of the photo:

1995 F series. Other years are similar.

Apr 13, 2017 | 07:54 AM

62FE4x4

Thread Starter

Tuned

Joined: Jul 2011

Posts: 470

Likes: 1

There are more codes to set off the red indicator light than just a low reservoir. The sensor on the parking brake pedal for instance. Neither of which would set off the ABS Light simultaneously. I replaced the pressure switch on the brake pedal that shuts the cruise off. That seems to have eliminated the issue. Thanks for all the input.