need help diagnosing brake issue

340Cuda · 11-29-2021, 12:07 PM

How have you bleed the brakes?

I have had best luck using a system that pressurizes the master cylinder and then liberally bleed fluid from each caliber.

I do use residual valves.

I have had problems in the past not too dissimilar to yours that I think are caused by the larger fluid volume of the rear brakes compared to the front.

Good luck and please share you fix when you find it.

Mike Pearson · 11-29-2021, 12:26 PM

First thing I would do is to make sure the calipers are perfectly square to the rotor. That is paramount to the brakes working correctly and not dragging. Then make sure the calipers are positioned correctly that the bleed screw is at the highest point of the caliper. After that I would take the pressure gauge and pressure switch out of the system and re bleed and check. Those two items would be suspect to not bleeding completely. You should not need a residual pressure valve.

GallopinGhost · 11-29-2021, 03:31 PM

I use a pressure bleeder which really is a nice piece.

Right now the rear brakes are connected to the rear port on the MC....

Quote:

Originally Posted by 340Cuda

How have you bleed the brakes?

I have had best luck using a system that pressurizes the master cylinder and then liberally bleed fluid from each caliber.

I do use residual valves.

I have had problems in the past not too dissimilar to yours that I think are caused by the larger fluid volume of the rear brakes compared to the front.

Good luck and please share you fix when you find it.

Kenney Kelley · 11-29-2021, 04:59 PM

The Strange Calipers that I have on my car have 2 bleed ports one on each side of the roter you have to bleed each side or your brakes will feel soft. I also use 3/16 lines and only use 3 rubber hoses 2 in the front and 1 going to the rear housing.I don't know if this will help your problem but it helped the problem we had on our other car.
Kenney Kelley

Rich Biebel · 11-29-2021, 06:44 PM

[QUOTE=GallopinGhost

Right now the rear brakes are connected to the rear port on the MC....[/QUOTE]

Reverse the lines so the front brakes are connected to the rear or primary port on the master.

A proportioning valve can be added if needed.

Dragsinger · 11-29-2021, 08:14 PM

I did not see your reply to this comment, "it is necessary to bleed both upper caliper bleeders"

Did you do so?

GallopinGhost · 11-29-2021, 09:33 PM

Yup, both sides everytime

11-29-2021, 12:07 PM	#1
340Cuda VIP Member Join Date: Apr 2003 Location: Tulsa, Oklahoma Posts: 1,675 Likes: 3,870 Liked 804 Times in 341 Posts	Re: need help diagnosing brake issue How have you bleed the brakes? I have had best luck using a system that pressurizes the master cylinder and then liberally bleed fluid from each caliber. I do use residual valves. I have had problems in the past not too dissimilar to yours that I think are caused by the larger fluid volume of the rear brakes compared to the front. Good luck and please share you fix when you find it.

11-29-2021, 12:26 PM	#2
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,453 Likes: 616 Liked 1,939 Times in 583 Posts	Re: need help diagnosing brake issue First thing I would do is to make sure the calipers are perfectly square to the rotor. That is paramount to the brakes working correctly and not dragging. Then make sure the calipers are positioned correctly that the bleed screw is at the highest point of the caliper. After that I would take the pressure gauge and pressure switch out of the system and re bleed and check. Those two items would be suspect to not bleeding completely. You should not need a residual pressure valve. __________________ Mike Pearson 2485 SS

11-29-2021, 04:59 PM	#4
Kenney Kelley Member Join Date: Dec 2006 Location: Cocoa Florida Posts: 205 Likes: 181 Liked 72 Times in 36 Posts	Re: need help diagnosing brake issue The Strange Calipers that I have on my car have 2 bleed ports one on each side of the roter you have to bleed each side or your brakes will feel soft. I also use 3/16 lines and only use 3 rubber hoses 2 in the front and 1 going to the rear housing.I don't know if this will help your problem but it helped the problem we had on our other car. Kenney Kelley

11-29-2021, 06:44 PM	#5
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,315 Likes: 25 Liked 544 Times in 213 Posts	Re: need help diagnosing brake issue [QUOTE=GallopinGhost Right now the rear brakes are connected to the rear port on the MC....[/QUOTE] Reverse the lines so the front brakes are connected to the rear or primary port on the master. A proportioning valve can be added if needed. __________________ Rich Biebel S/C 1479 Stock 147R

11-29-2021, 08:14 PM	#6
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: need help diagnosing brake issue I did not see your reply to this comment, "it is necessary to bleed both upper caliper bleeders" Did you do so? __________________ Larry Woodfin 471W

11-29-2021, 09:33 PM	#7
GallopinGhost Member Join Date: Jun 2010 Location: VA Posts: 230 Likes: 23 Liked 21 Times in 13 Posts	Re: need help diagnosing brake issue Yup, both sides everytime __________________ Brian Carpenter Stock 1358