My master cylinder is leaking in the back 1991 gmc sierra 4x4

SOURCE: 1999 GMC Sierra brake problem

When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.

Gravity bleeding is when you just open the valve and let gravity pull the fluid down.

Keep in mind you must "prime" the master cylinder first before installing it, did you do that?

Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.

After this procedure you gravity bleed the brakes, then go on to the pedal technique.

Wade Cook

• 6 Answers
• Posted on Jan 27, 2009

SOURCE: 4X4 inop on 2003 GMC Sierra 2500HD

I have found that when you are going to engauge 4x4 high, it is best to only be going about 3 miles an hour. Not faster, not stopped. It likes some movement to help it mesh. I've had perfect shifts since I started this. Hope it helps. Wade.

SOURCE: where is the 4x4 encoder motor sensor located on my 03 sierra

the encoder motor sensor is inside the encoder motor. the encoder is located at the transfer case. Remove the encoder and by part number 88962315 this is the sensor. you will have to retime the motor after
hope this helps

SOURCE: replace sway bar end links '97 GMC Sierra

if you put your vehicle information in at advanceautoparts.comyou can search sway bar and find parts that you need - there was someinfo missing on which sierra model you have as far as engine size andvin # match but I came to: http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/partlist_Sway-Bar-Link-Kit_78_R|GRPCHASAMS__sway%20bar___

SOURCE: I have an 1991 gmc sierra K1500 4x4 my transfer

Try Replacing the Transfer Case.