Brake Problem 10 Years, Never Solved! - Clevis Adjustment?

[Benjamin]

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[RichardJ]

It seems, some don't understand what pedal freeplay is or maybe it's just a matter of the explanation.

Freeplay is observed so that no pressure is applied directly to the MC piston, before you place your foot on the pedal.
IE, it's the distance between the pedal at rest and the pedal moving the distance needed to up linkage slack.

The pedal at rest, should be against a rubber stop.

A different hole in the pedal arm would change pedal leverage and pedal travel, but pedal freeplay would be readjust after an such mechanical change is made.

Freeplay should be checked with your fingers and not your foot.

I think CPP's drawing needed a little help.

[Andy4639]

Originally Posted by Leonard1

So at rest, the return spring holds tension on the pushrod, and the pushrod is what keeps the pedal from touching the rubber stop?

Sorry davepl, I wasn't meaning to hijack your thread.

The spring is what pulls the rod back away from the master cylinder, so no it want have pressure on it.
The brake pedal itself is only able to come back so far with the rod attached. If you take the rod loose and leave the spring hooked up the pedal will slam against the bracket under the column that the rubber bumper is attached to.

This is why I posted that if you are adjusting the pedal start by cutting a piece of wood to use as a brace against the seat frame and brake pedal to take the load off the rod to adjust it. This also helps with adjusting the brake switch.

By the way my 64 SS Impala has a brake pedal spring also.

[Andy4639]

Originally Posted by RichardJ

It seems, some don't understand what pedal freeplay is or maybe it's just a matter of the explanation.

Freeplay is observed so that no pressure is applied directly to the MC piston, before you place your foot on the pedal.
IE, it's the distance between the pedal at rest and the pedal moving the distance needed to up linkage slack.

The pedal at rest, should be against a rubber stop.

A different hole in the pedal arm would change pedal leverage and pedal travel, but pedal freeplay would be readjust after an such mechanical change is made.

Freeplay should be checked with your fingers and not your foot.

I think CPP's drawing needed a little help.

Where you put your pedal at rest is a opinion on how high you want your pedal off the floor at rest. It doesn't have to be up against the bumpers. The bumpers in my opinion are for when you let your foot off the brake and the spring slams the pedal back. It's not for the pedal at rest position other than that's where you like it to be.