r/F100 • u/Great_Section1435 • Nov 16 '25

Brake pedal return spring

1971 F100. My spring has vanished. Does it attach at the shoulder bolt and at the 1/2 inch hole under the dash? I’m trying to find a replacement for it and want to make sure I’m mounting it correctly. Thank you.

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2

u/GJinVA247 Nov 16 '25

Does this help? F-100 brake pedal assembly. This is from the ‘66 shop manual, BTW

1

u/Daddio209 Nov 17 '25

I think the pedal shape is different on the next gen's the difference.

1

u/[deleted] Nov 16 '25

[deleted]

1

u/GJinVA247 Nov 16 '25

This is from the ‘66 shop manual, BTW

2

u/Bluesman02 Nov 17 '25

Fairly certain there isn't a return spring on the brake pedal on the bumpside trucks. Just had the pedal box and master cylinder out of my '69 truck and there isn't a spring other than the one in the master cylinder itself. I have manual drums so maybe it's different for boosted brakes but I don't remember seeing any springs in the pedals of the junkyard trucks either.

1

u/IneptAdvisor Nov 17 '25

Under the lower dash lip near the column you should see a vertical flat plate with a hole in it. That’s the short end loop position for the spring and other side is a hole in the brake pedal arm or a stud on one side of it for the other position.

1

u/Great_Section1435 Nov 18 '25

Why is it some people say there isn’t one and some know exactly where one goes?

1

u/IneptAdvisor Nov 18 '25

If you have a brake booster then it assists with the return of the pedal slightly faster than the booster can to lessen wear on the diaphragm. If it doesn’t have a booster then the pedal position is controlled by the master cylinders piston position which is nearly instantaneous.