Brake Question

[Bobby Fazio]

Has anyone used the smaller 1 1/16" bore master cylinder with 4 wheel disc brakes and 4-piston calipers? Aerospace & Strange both stipulate 1 1/8" but am looking to get a little more brake pressure. Pedal ratio is currently 6:1

[Tom Goldman]

you will gain approximately 175-200# pressure over the 1 1/8" bore cylinder but you will loose a substantial amount of pedal feel . Time to hit the gym and head to the leg press !

[Kirk Morgan]

Get a pressure gauge and check it at the calipers. We talked to Strange and the pressure should be 1000 to 1200 PSI. If you have good pressure the pads and or rotors maybe glazed. Also check the firewall for flexing or cracks.

[Bob Gullett]

Originally Posted by Bobby Fazio

Has anyone used the smaller 1 1/16" bore master cylinder with 4 wheel disc brakes and 4-piston calipers? Aerospace & Strange both stipulate 1 1/8" but am looking to get a little more brake pressure. Pedal ratio is currently 6:1

We recently replaced the master cylinder in the SS car. They’re Lamb brakes and had a 1 1/8? M/C on it. When Lamb sent us a new one it was a 1 1/16. Has no problem getting to a 1000 pounds plus.

[Henrys Toy]

Originally Posted by Bobby Fazio

Has anyone used the smaller 1 1/16" bore master cylinder with 4 wheel disc brakes and 4-piston calipers? Aerospace & Strange both stipulate 1 1/8" but am looking to get a little more brake pressure. Pedal ratio is currently 6:1

Good morning Bob and to all,
Just a quick question on this, are you having trouble holding the car on the starting line while foot braking or are you having trouble stopping the car?

Respectfully,
Henry Kunz 1534 H/SA

[Bobby Fazio]

Originally Posted by Henrys Toy

Good morning Bob and to all,
Just a quick question on this, are you having trouble holding the car on the starting line while foot braking or are you having trouble stopping the car?

Respectfully,
Henry Kunz 1534 H/SA

Starting line foot braking.

[Henrys Toy]

Originally Posted by Bobby Fazio

Starting line foot braking.

Bob,
You might want to check with your brake caliper Manufacture and see if they have available a different "compound" brake pad material. There is usually different materials depending on the weight, and speed of the vehicle and temperatures your rotors see. Since its the starting line, you might need an aggressive material because the temps won't be very high. There is a company named EBC that make some really good quality pads for various performance uses. I would still check with your caliper Mfg. and explain your situation and see what they suggest. If you aren't satisfied after that then I would consult with someone like EBC and see if they can't help you. You might even need a "standard pad " for the fronts - so you can hold the car in the water with the line lock and an " aggressive " pad for the rears, to hold the car at an elevated RPM against the converter. I hope this helps, have a Good Day!

Respectfully,
Henry Kunz 1534 H/SA

[Bobby Fazio]

Originally Posted by Henrys Toy

Bob,
You might want to check with your brake caliper Manufacture and see if they have available a different "compound" brake pad material. There is usually different materials depending on the weight, and speed of the vehicle and temperatures your rotors see. Since its the starting line, you might need an aggressive material because the temps won't be very high. There is a company named EBC that make some really good quality pads for various performance uses. I would still check with your caliper Mfg. and explain your situation and see what they suggest. If you aren't satisfied after that then I would consult with someone like EBC and see if they can't help you. You might even need a "standard pad " for the fronts - so you can hold the car in the water with the line lock and an " aggressive " pad for the rears, to hold the car at an elevated RPM against the converter. I hope this helps, have a Good Day!

Respectfully,
Henry Kunz 1534 H/SA

Thanks Henry, I recently began running Aerospace DR97 pads front & rear, which are pretty aggressive. Aerospace uses them in the rear only and use a HP+ motorcross pad up front. Their master cylinder is a 60/40 front to rear according to their instructions and actually calls for 7:1 pedal ratio. Once I get more pressure I am debating taking the DR97 pad out of the front and going to the DTC30 pad up there to avoid locking up the fronts down at the finish line. Has anyone else run DR97 compound up front?

[1320racer]

Aerospace brakes/components are way down on the list of drag car brakes. There is a difference.

[1320racer]

Originally Posted by Bobby Fazio

Has anyone used the smaller 1 1/16" bore master cylinder with 4 wheel disc brakes and 4-piston calipers? Aerospace & Strange both stipulate 1 1/8" but am looking to get a little more brake pressure. Pedal ratio is currently 6:1

Yes, my master cylinder is Wilwood #260-4893 used with MW 4 piston calipers and Ferodo pads.



From 2008 through 2018 my Firebird was footbrake launched, staged at 4200 to 4500rpm.