no Front Brakes
Thread Starter
Cruising
Joined: Jun 2010
Posts: 11
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From: Appleton WI
no Front Brakes
Visit often, but never posted. I just painted all of my calipers, put in the rear brake spring and stainless steel brake lines and new fluid. I have pressure at the rear brakes but not the front. Any help would be great. This is an awesome web site and everyone is very helpful with providing great information. Thanks in advance
Pro
Joined: Aug 2007
Posts: 509
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From: Livonia Michigan
Visit often, but never posted. I just painted all of my calipers, put in the rear brake spring and stainless steel brake lines and new fluid. I have pressure at the rear brakes but not the front. Any help would be great. This is an awesome web site and everyone is very helpful with providing great information. Thanks in advance
Team Owner
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From: Riverside County Southern California
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Melting Slicks
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From: Palm Beach
Thread Starter
Cruising
Joined: Jun 2010
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From: Appleton WI
Le Mans Master
Joined: May 2006
Posts: 9,226
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From: Irvine Ca
OK......ask someone to pump the brakes for you, watch inside those cups for some sort of fluid movement....
I'm aiming at the possibility that something (crud or whatever) is blocking the front cup and not allowing fluid to drop down into the MC
I'm aiming at the possibility that something (crud or whatever) is blocking the front cup and not allowing fluid to drop down into the MC
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Thread Starter
Cruising
Joined: Jun 2010
Posts: 11
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From: Appleton WI
Wouldn't that cause some suction in the hand vacuum pump at all? If I do press down on the brake they go right to the floor with no resistance.
Race Director
Joined: Dec 2006
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I'd start with a bench bleed of the MC. You can do it on the car but need the bore of the MC to be level. If you put a small level on the MC lined up with the bore you will see how much you need to raise the rear to get it level and choose then to either do it in situ or on the bench. Install the MC bench bleeder lines and only when the air is out of the MC proceed to the lines and slaves.
Le Mans Master
Joined: May 2006
Posts: 9,226
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From: Irvine Ca
I mean, it is odd that this happens at this time...but since the system is old etc. maybe it happened......
It's a simple mechanism....and only a few things could be wrong......if fluid is not pouring out somewhere...then the only other two options are "Blow By"
The only two places that "blow by" can occur are
A.) at the Master Cylinder
B.) at the brake caliper.
So, you have faulty calipers or faulty MC.
Le Mans Master
Joined: May 2006
Posts: 9,226
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From: Irvine Ca
maybe you sucked something into the small hole while using that vacuum. It's just odd that the steps you've taken lead you to where you are now.....something strange occurred. I re-read your initial post trying to get a clue....
Le Mans Master
Joined: Sep 2006
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From: Phoenix AZ
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make sure that the bleeder holes are open on both fronts, and then see if gravity allows any bubbles or fluid at the calipers. if there are no bubbles or even a drip, there is a line blockage of some sort. Don't forget to close the bleeders.
I would also believe that you may have unknowingly let some bit of debris into the line, and blocked something.
What I would do, is have someone press on the pedals while you look into the master cups. both of them should get a pressure wave in the fluid when the pedal is pushed. I have noticed this when I have an assistant pressing the pedal for me.
On my 57 chevy pickup, the master is under the floor. I can actually press the pedal and look directly into the master cylinder reservoir and see the pressure wave as I move it.
This leads me to believe that all master cylinders experience this event.
try it on yours.
I would also believe that you may have unknowingly let some bit of debris into the line, and blocked something.
What I would do, is have someone press on the pedals while you look into the master cups. both of them should get a pressure wave in the fluid when the pedal is pushed. I have noticed this when I have an assistant pressing the pedal for me.
On my 57 chevy pickup, the master is under the floor. I can actually press the pedal and look directly into the master cylinder reservoir and see the pressure wave as I move it.
This leads me to believe that all master cylinders experience this event.
try it on yours.
Thread Starter
Cruising
Joined: Jun 2010
Posts: 11
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From: Appleton WI
make sure that the bleeder holes are open on both fronts, and then see if gravity allows any bubbles or fluid at the calipers. if there are no bubbles or even a drip, there is a line blockage of some sort. Don't forget to close the bleeders.
I would also believe that you may have unknowingly let some bit of debris into the line, and blocked something.
What I would do, is have someone press on the pedals while you look into the master cups. both of them should get a pressure wave in the fluid when the pedal is pushed. I have noticed this when I have an assistant pressing the pedal for me.
On my 57 chevy pickup, the master is under the floor. I can actually press the pedal and look directly into the master cylinder reservoir and see the pressure wave as I move it.
This leads me to believe that all master cylinders experience this event.
try it on yours.
I would also believe that you may have unknowingly let some bit of debris into the line, and blocked something.
What I would do, is have someone press on the pedals while you look into the master cups. both of them should get a pressure wave in the fluid when the pedal is pushed. I have noticed this when I have an assistant pressing the pedal for me.
On my 57 chevy pickup, the master is under the floor. I can actually press the pedal and look directly into the master cylinder reservoir and see the pressure wave as I move it.
This leads me to believe that all master cylinders experience this event.
try it on yours.
Thread Starter
Cruising
Joined: Jun 2010
Posts: 11
Likes: 0
From: Appleton WI
Le Mans Master
Joined: May 2006
Posts: 9,226
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From: Irvine Ca
oh oh oh....that is right...you were using that pump.....
I see how that would make my initial thoughts incorrect. See, if you were using the friend method of "Pump, hold, release" you would have seen that fluid coming out.....
Glad you found it
I see how that would make my initial thoughts incorrect. See, if you were using the friend method of "Pump, hold, release" you would have seen that fluid coming out.....
Glad you found it
Team Owner
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Did you ensure the brake safety/shuttle valve is centered?
If not, the valve will shut off brake pressure to F/R depending upon the direction of the valve.
If not, the valve will shut off brake pressure to F/R depending upon the direction of the valve.
Le Mans Master
Joined: Aug 2000
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From: Australia
