poor braking - Page 2

Larry Hill · 09-09-2023, 09:10 PM

I race the Cuda without the valve.

Gmirza · 09-09-2023, 11:19 PM

Quote:

Originally Posted by Doug Domm

Any particular reason to only use braided front brake hoses?

I ran stock hoses with the factory disc. I believe with the Strange brakes you have to use the braided line for the required fittings. Like John said they don’t expand giving a firm pedal.

Gmirza · 09-09-2023, 11:27 PM

Quote:

Originally Posted by back for more

thanks for the info does anyone have the part number for the volarie style master cylinder? would i be better off going back to the stock master cylinder? also i was told to delete the proporting valve all together was that a bad idea?

You can look up the part number on Rock Auto.
This is a dumb question, but do you have the lines hooked up to the proper ports on the master cylinder? Front to the rear and rear to the front.
Did the car have a power booster in it originally? Like someone else said in an earlier reply, the pedal ratio could be the issue.

Larry Hill · 09-10-2023, 08:03 AM

Don’t use the stock type rubber hose over time it will deteriorate and will cause a restriction on on the return flow back to the master cylinder.

rebelrouser · 09-10-2023, 09:31 AM

Change the master cylinder bore to a smaller diameter, I usually use one inch. The smaller the bore of the master cylinder the more force at the wheels. Pascal's law is used to calculate a well balanced brake system.

14.3 Pascal’s Principle and Hydraulics | University Physics Volume 1 (lumenlearning.com)

Dave Gantz · 09-10-2023, 02:34 PM

Don't forget the hose between the frame and the rear axle.

back for more · 09-10-2023, 07:54 PM

thanks for all the info parts are ordered

Kenney Kelley · 09-14-2023, 11:44 PM

If installing Disk Brakes in the front and keeping the stock rear brakes you should install a Residual Pressure Valve i'm not too sure about the one you should use a 2 LB or 10 LB between the Master cylinder and the rear brakes according to Strange Engineering it also says to replace the 3 rubber hoses and install 3/16 steel lines

Kenney Kelley

GTX JOHN · 09-15-2023, 04:43 AM

Didn't the Disc Brake master cylinders have a residual
pressure valve right before the lines factory. It looks like
it would install in any mopar cylinder. We do not use any
on all our race cars. I worry about even a small amount of drag.

Eman · 09-16-2023, 12:24 PM

If you really want to diagnose then you need a pressure gauge. As someone mentioned smaller bore MC means increased brake pressure but also less fluid volume per stroke. Larger bore less pressure but more volume. Rock hard pedal is good but you might have other problems. What condition are the back brakes, most assume everything is good if they aren't leaking but wheel cylinders freeze up, good pedal just no braking action.

09-09-2023, 09:10 PM	#11
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,587 Likes: 1,872 Liked 10,590 Times in 2,190 Posts	Re: poor braking I race the Cuda without the valve. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

09-10-2023, 08:03 AM	#14
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,587 Likes: 1,872 Liked 10,590 Times in 2,190 Posts	Re: poor braking Don’t use the stock type rubber hose over time it will deteriorate and will cause a restriction on on the return flow back to the master cylinder. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

09-10-2023, 09:31 AM	#15
rebelrouser Junior Member Join Date: Apr 2023 Posts: 6 Likes: 0 Liked 6 Times in 2 Posts	Re: poor braking Change the master cylinder bore to a smaller diameter, I usually use one inch. The smaller the bore of the master cylinder the more force at the wheels. Pascal's law is used to calculate a well balanced brake system. 14.3 Pascal’s Principle and Hydraulics \| University Physics Volume 1 (lumenlearning.com)

09-10-2023, 02:34 PM	#16
Dave Gantz Senior Member Join Date: Nov 2005 Location: Verrry South Jersey Posts: 537 Likes: 134 Liked 251 Times in 125 Posts	Re: poor braking Don't forget the hose between the frame and the rear axle.

09-10-2023, 07:54 PM	#17
back for more Junior Member Join Date: Jan 2021 Posts: 6 Likes: 1 Liked 1 Time in 1 Post	Re: poor braking thanks for all the info parts are ordered

09-14-2023, 11:44 PM	#18
Kenney Kelley Member Join Date: Dec 2006 Location: Cocoa Florida Posts: 204 Likes: 174 Liked 70 Times in 35 Posts	Re: poor braking If installing Disk Brakes in the front and keeping the stock rear brakes you should install a Residual Pressure Valve i'm not too sure about the one you should use a 2 LB or 10 LB between the Master cylinder and the rear brakes according to Strange Engineering it also says to replace the 3 rubber hoses and install 3/16 steel lines Kenney Kelley

09-15-2023, 04:43 AM	#19
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,710 Likes: 2,737 Liked 2,404 Times in 681 Posts	Re: poor braking Didn't the Disc Brake master cylinders have a residual pressure valve right before the lines factory. It looks like it would install in any mopar cylinder. We do not use any on all our race cars. I worry about even a small amount of drag. __________________ John Irving 741 Stock 741 Super Stock

09-16-2023, 12:24 PM	#20
Eman Member Join Date: May 2014 Location: E TN Posts: 463 Likes: 16 Liked 125 Times in 71 Posts	Re: poor braking If you really want to diagnose then you need a pressure gauge. As someone mentioned smaller bore MC means increased brake pressure but also less fluid volume per stroke. Larger bore less pressure but more volume. Rock hard pedal is good but you might have other problems. What condition are the back brakes, most assume everything is good if they aren't leaking but wheel cylinders freeze up, good pedal just no braking action.