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Old 08-15-2009, 11:57 AM
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no brake pressure

Im restoring a 64 chevelle convertable,I have installed all new 4-wheel disc,new lines,stainless hoses,master cyl,brake booster and prop valve
Im in the process of bleeding brakes and cant get any pressure
I bought the master cyl kit from Right Stuff Detailing and called them,they told me to disconnect the lines to master and plug them,then push on pedal,should be firm. I did this, and it is,then when I hook up back to the system it goes to floor.All my stuff is new,calipers,lines everything. I dont see and fluid dripping or leaking,could it be a bad prop valve? I need brakes on this car I will submit pics of car just wanted to get this out for some info thanks

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Old 08-15-2009, 12:28 PM
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For grins try this.

Get someone to pump the brake pedal, and just crack loose the right rear bleeder screw. Put your finger over the bleeder screw nipple applying pressure to it, and have them pump the pedal until no air, or foaming fluid comes out. Close that bleeder screw while you are still applying pressure to it, and they are pumping the pedal.

Go to the left rear and do the same procedure. Do the right front, and then the left front. Keep checking, and filling the reservoir frequently.

The pedal pusher, should start to get a real hard pedal, and you should get a lot of clean/clear fluid out.

As a side note; The bleeder screws need to be on the top of the calipers. Yes, I have pulled wheels and found this as the problem before. (calipers mounted on the wrong sides).
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Old 08-15-2009, 12:50 PM
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I think the system is full of air, open all bleeders and let it "gravity bleed" for awhile. you may pump the peddle some what ,but slow, with all the bleeders open' it may suck air back in but, more fluid will go in than air is sucked back, if you get fluid dripping from a bleeder, close it and waite for the others to drip and close them ounce they do. Then Bleed the system with a freind from farthest to closest bleederto the master depending on the layout. Also once you get any resitance at the peddle bleed direct at the master.
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Old 08-15-2009, 12:58 PM
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AHhhhhhhhhh!

Do NOT pump the brake pedal with ant bleeder screws open. Fluid is heavier than air, and air is going to be sucked in, not fluid from the reservoir
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Old 08-15-2009, 02:10 PM
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Ok check this out,I looked at my bleeders,the front ones are pointing up the rear ones are pointing down,Do I have them on the wrong side? Thanks for the replys so quick
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Old 08-15-2009, 02:14 PM
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are the bleeder in the rear at the top of the cylinder unit if not they may be backward, bleeder needs to be ontop to let all trapped air out.
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Old 08-15-2009, 02:15 PM
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Yes the bleeders are on the bottome on rear,they are GM disc conversion on a 9" ford rear
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Old 08-15-2009, 02:15 PM
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Quote:
Originally Posted by lugnut1728
Ok check this out,I looked at my bleeders,the front ones are pointing up the rear ones are pointing down,Do I have them on the wrong side? Thanks for the replys so quick
There is your problem.

You will never get the air out of the rear calipers, just switch them side to side. I have seen professional mechanics do this, so don't feel bad.

Last edited by carsavvycook; 08-15-2009 at 02:21 PM. Reason: addition
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Old 08-15-2009, 02:16 PM
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So they will fit on either side?
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Old 08-15-2009, 02:22 PM
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Quote:
Originally Posted by lugnut1728
So they will fit on either side?

Yes
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Old 08-15-2009, 02:23 PM
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Thanks alot! Going to switch them now!
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Old 08-15-2009, 02:33 PM
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Gravity bleeding of the brakes may just work now.
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Old 08-15-2009, 03:21 PM
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I have seen this many times and not always rookies either.
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Old 08-15-2009, 03:36 PM
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Originally Posted by T-bucket23
I have seen this many times and not always rookies either.
At least all it will cost, is a little time, a little more brake fluid, and maybe a couple of aspirins.
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Old 08-15-2009, 03:38 PM
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I recently put discs from a 72 Chevell onto my 66 Elky
using the booster from the 72, master for a 67 with discs, & a new line set for a 67 with the ditribution block.

Took about 1/2 hour for the fronts to start dripping, and the rears needed some help.

finally got fluid to the rear, and decided I will get them properly bled when I return from a trip.

When I put 4-wheel discs on my 59----I thought I would NEVER get those bled out.

Some of these things are just a pain
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