If it is a brand new master cylinder, it needs to be bench bled. If it was removed from the vehicle, it needs to be bench bled. If the brake lines were disconnected from it and there was a lot of fluid loss, it needs to be bench bled. If the reservoir was empty or very low and sucked air when the brakes were applied, it needs to be bench bled. If in doubt, bench bleed it. It's one of your vehicle's most important safety features, don't risk your safety, or the safety of others, for the sake of saving a few minutes of time or doing a little less work.
Need to know how to assemble 95 Chevy clutch master cylinder?
Get someone to help you and bleed the brakes again. You should have bench bled the master cylinder before installing. Start at the right rear, then go to the left rear, right front, and end at the left front brake. Bleed each caliber until you see no more air escaping. If you do not know how to bleed your brakes a Google search will give you instructions. If you do it right, assuming the Master Cylinder is good, you will have good brakes. I have seen rebuilt master cylinders that were defective out of the box. If you bought a rebuilt master cylinder, I would recommend you return it and get a new master cylinder. Rebuilt products today are not rebuilt in the U.S. and it is common for them to be defective. Buy new!
It is important to bleed a clutch master and slave cylinder to make sure all of the air is out of the lines. For a 1989 Chevy you would need to know model you had, and then find the repair manual for that specific vehicle.
Whenever you are having a problem with the clutch disengaging the engine from the transmission it is advisable to bleed the clutch slave cylinder. If the clutch can't be operated by bleeding the slave cylinder then the clutch master cylinder is gone and should be replaced.
Trying to bleed my 2001 f250 master hyd. clutch and slave cylinder but there are no bleeder valves on either one, I know it has air in lines but can't seam to get it out.
how do i know the master cylinder is bad ?
A brake master cylinder? If you are losing brakes or brake fluid.
this is a 2 man job period, top up the master cylinder and pump your petal as you would doing a brake bleed job, there will be a master slave cylinder on the transmission with a nipple on it (I don't know the actual size but I believe its 5/16" or so) it will look and feel like a grease nipple, just crack that open and shut it when the petal hits the floor, repeat as nesscary, don't forget to keep toping the clutch master cylinder The slave clyinder on my 1991 F 150 does not have a bleeder nipple !
It's on the master cylinder on the firewall. If you do not know what a master cylinder is do a google on it and get some pics.
i dont know thats why im asking the internet
Its not bad, but if you've never done it before, go get a repair manual form an autoparts store. You will need to know what you are doing when you bleed it.
my husband is trying to replace the master cylinder on a 1994 grand am. he was wondering on how to align the gears for the abs.