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Writer/Teacher
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Slave/Master Cylinder Procedure Question
I am in the process of replacing my master and slave cylinders (clutch pedal went to the floor). When I got upside-down in the footwell, I saw that there was brake fluid all over the bottom of the boot. This says to me that it was the master cylinder that failed, but I am planning on replacing the slave as well.
By the time I realized that I need a 7mm wrench to bleed the slave cylinder, all the auto parts stores and hardware stores were closed, so that will have to wait until tomorrow. But here's my question: The new master cylinder is in the car, and the brake fluid reservoir is filled. Shouldn't there be some pressure in the clutch pedal now, considering that I am about 99% sure that it was the master cylinder that failed? I tried pumping it, but it just went right back to the floor. Or will no pressure build until I begin to bleed the system? I figured I'd be able to get SOME pressure back into the pedal before bleeding it...
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08-03-2008, 06:27 PM
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Trying to work for parts!
Join Date: Oct 2006
Location: MO
Posts: 1,760
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Once you let air into the system it's going to go to the floor. Going to have to bleed it.
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08-03-2008, 07:28 PM
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Parrothead member
Join Date: Jul 2003
Location: Monmouth county, NJ USA
Posts: 13,859
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You have to get all the air out, all the way down to the slave cylinder, before you will have any pedal pressure. Fill the reservoir all the way up, open the bleeder on the slave. Let the fluid run through the lines down to the slave. it should drip out. once that happens then you can bleed it normally. Thats the best way I found.
After six master cylinder changes, i've become very good at this! 
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Vinny Red '86 944, 05 Ford Super Duty Dually '02 Ram 3500 Diesel 4x4 Dually, '07Jeep Wrangler '62 Mercury Meteor '90 Harley 1200 XL "Live your Life in such a way that the Westboro Baptist Church will want to picket your funeral." |
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08-04-2008, 04:53 AM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
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