Brake Pedal Height

[Black_Sheep]

Due to a non-stock master cylinder and 4 hole to 2 hole master cylinder adapter I am using an adjustable master cylinder pushrod. Currently it seems like my brake pedal is a little too high, making the transition from the throttle to the brake pedal kind of awkward. Can someone with a stock brake system take a measurement from the toe board to the brake pedal for comparison?

Thanks in advance…

 

[danf_fl]

On my '68 Charger, the resting brake pedal is very close to the level of the accelerator.

 

[69B7RR]

If it helps, this is the measurement off my 69RR, original manual drum master & rod….7 1/2” from floorboard (no insulation or carpet thickness) to bottom of pedal pad. If u need anything else let me know….I enjoy following your posts….jim

 

[68 Sport Satellite]

(EDIT)
keep in mind, the smaller the MC bore size, the lower the brake pedal will be towards the floor at full extension. (a 7/8" bore MC pedal travels farther than a pedal connected to a 1-1/8" bore MC)

 

[Black_Sheep]

If it helps, this is the measurement off my 69RR, original manual drum master & rod….7 1/2” from floorboard (no insulation or carpet thickness) to bottom of pedal pad. If u need anything else let me know….I enjoy following your posts….jim

View attachment 1602163

Thanks, that is exactly what I was looking for.

keep in mind, the smaller the MC bore size, the lower the brake pedal will be towards the floor at rest. (a 7/8" bore MC pedal sits lower than a pedal connected to a 1-1/8" bore MC)

The same MC has been on the car since I converted to Wilwood 4 piston calipers a year or so ago. The smaller bore provides higher pressure but requires more pedal travel, at least that’s been my experience. I don’t want the pedal awkwardly high or uncomfortably close to the floor with the brakes applied. It needs a bit of tweaking but I’ll find a happy medium now that I have a baseline…

 

[pnora]

Mine is 6 1/2 off the carpet and padding.

 

[Black_Sheep]

I adjusted the pedal from 8.5” to 7.25”, the transition from the throttle to brake is a lot better.

 

[68 Sport Satellite]

I adjusted the pedal from 8.5” to 7.25”, the transition from the throttle to brake is a lot better.

View attachment 1603066

what was your method of adjustment?

 

[Black_Sheep]

what was your method of adjustment?

This has the correct flats to properly engage the brake light switch

Right Stuff Detailing RC14 Right Stuff Detailing Brake Push Rods | Summit Racing

 

[Kern Dog]

keep in mind, the smaller the MC bore size, the lower the brake pedal will be towards the floor at rest. (a 7/8" bore MC pedal sits lower than a pedal connected to a 1-1/8" bore MC)

I don't think that is right. The pistons in the master cylinders all rest at the back of the housings.
What differs is that a larger bore master cylinder reacts in a much shorter travel distance due to the increased volume in each inch of stroke. A smaller bore unit has to travel further due to the decreased volume in each inch of stroke.
In most cases, a manual master cylinder setup does result in a pedal height off the floor a little higher than a power setup. I have 3 cars at home with manual 15/16" master cylinders and they all sit off the floor at least 1 1/2" higher than my power setup in my red car.

 

[68 Sport Satellite]

I don't think that is right. The pistons in the master cylinders all rest at the back of the housings.
What differs is that a larger bore master cylinder reacts in a much shorter travel distance due to the increased volume in each inch of stroke. A smaller bore unit has to travel further due to the decreased volume in each inch of stroke.
In most cases, a manual master cylinder setup does result in a pedal height off the floor a little higher than a power setup. I have 3 cars at home with manual 15/16" master cylinders and they all sit off the floor at least 1 1/2" higher than my power setup in my red car.

I concur. I had remembered it wrong. Smaller bore has longer travel distance so pedal at full extension is closer to the floor. Rest height is same.

 

[68 Sport Satellite]

This has the correct flats to properly engage the brake light switch

Right Stuff Detailing RC14 Right Stuff Detailing Brake Push Rods | Summit Racing

Are your brakes manual or power? I haven’t seen that adjustable rod before. In my power brake setup I do have an adjustable rod between the booster and MC bore contact.

 

[Black_Sheep]

Are your brakes manual or power? I haven’t seen that adjustable rod before. In my power brake setup I do have an adjustable rod between the booster and MC bore contact.

Manual with front disc / rear drum

 

[68-500]

First thing I noticed when I switched my Coronet to manual brakes was higher pedal at rest. All factory parts.

 

[68 Sport Satellite]

one day i might switch back to manual brakes. I used to drive a different older car with 4 wheel manual drums for 20 years and brake pedal feel and day to day stopping was excellent.

 

[Kern Dog]

one day i might switch back to manual brakes. I used to drive a different older car with 4 wheel manual drums for 20 years and brake pedal feel and day to day stopping was excellent.

That day could be now. I have everything here to make that happen. (At no additional charge)