Brakes help - Page 2

Dave Muller · 05-12-2019, 10:30 AM

For what it's worth I changed the pedal ratio and wound up never installing the proportioning valve that I bought. If anything the pedal is a little soft, but I can get over 1000 PSI easily in one shot and it holds fine on the line (as long as the 2-step in on...).

It took a could of tries to find the right bore size for the master cylinder but it was worth taking the time to work it out. I wound up with 1 1/8 inch.

RobbieRacer · 05-12-2019, 01:00 PM

Quote:

Originally Posted by jerry witzel

Here's an adapter for the master cylinder. https://www.ebay.com/itm/Pro-5-0-79-...wAAOSw7cZcM86v

I have one of these already

Mark Yacavone · 05-12-2019, 11:30 AM

Quote:

Originally Posted by Alan Nyhus

Case hardening only hardens the surface. The material under the hardened surface remains unaltered.

-Al

Makes sense. Might be then. Once you get the drill bit started, it'll go.
I'm sure the pedal arm is hardened for safety reasons.

Dave Noll · 05-12-2019, 03:02 PM

Quote:

Originally Posted by Mark Yacavone

Makes sense. Might be then. Once you get the drill bit started, it'll go.
I'm sure the pedal arm is hardened for safety reasons.

Quote:

Originally Posted by Alan Nyhus

Case hardening only hardens the surface. The material under the hardened surface remains unaltered.

-Al

Machining through a 60Rc surface can be done, but not easily at all.

Speeds and Feeds
SFM IPM DOC (Inch Depth of Cut)
Carbon And Alloy
Steels (50-60 Rc) 300-500 0.002-0.008 0.003-0.020
Die Steels (55-65 Rc) 150-350 0.002-0.008 0.003-0.008

RobbieRacer · 05-12-2019, 01:03 PM

Quote:

Originally Posted by Dave Noll

Umm, If it is actually Case Hardened, A solid carbide drill bit is not going through it. I like the welding in an extra 2", that will give more leverage but will put the pedal close to the floor.

My car has 2 stubs welded on the brake pedal lever from the factory. I also put as large of a Rear wheel cylinder I could find on the Fronts. (4 wheel drums)

Mine only has one stub and it's also welded on.

gsa612 · 05-12-2019, 11:48 AM

If your doing any mods to the MC make sure the pushrod is secure so it don't fall out from the back of the master. gsa612

05-12-2019, 10:30 AM	#1
Dave Muller Member Join Date: Apr 2014 Location: Mesa, AZ Posts: 497 Likes: 162 Liked 223 Times in 73 Posts	Re: Brakes help For what it's worth I changed the pedal ratio and wound up never installing the proportioning valve that I bought. If anything the pedal is a little soft, but I can get over 1000 PSI easily in one shot and it holds fine on the line (as long as the 2-step in on...). It took a could of tries to find the right bore size for the master cylinder but it was worth taking the time to work it out. I wound up with 1 1/8 inch.

05-12-2019, 11:48 AM	#6
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Brakes help If your doing any mods to the MC make sure the pushrod is secure so it don't fall out from the back of the master. gsa612