master cylinder

[ratesguy]

I am getting brake pedal softness intermittantly. Brakes will pump back up. All systems check out so I assume my master cylinder is going out. How much should I expect for a new master cylinder and are aftermarket parts or interchangeable parts available? This is a 2003 H2 with 99,000 miles.:crying:

[HUMMERcustoms.com/TAZ]

I have not checked price so cannot help there but, had a little advice I wanted to pass on when you do make repairs.

With milage You have I would replace the rubber brake lines with flexible steel. The rubber liness with age and it does not take long but, they will expand with pressure and need more fluid to get job done which cause a real spungy feeling. The lines connect at steel lines going out to the brake slave cylinders on each wheel that receive the fluid to move calipers out to rotors for braking. I would also if not done recently and you plan to keep your H2 look at pads and rotors. I mean afterall stopping the monster is a big job 7500lbs. Rotors may just need turning. All these things will really get you stopped quick. If you have allot of HP etc. pushing the power go to larger size rotors and calipers with m ore cylinders pushing pads against rotor.

I do not even need brakes but, I have got to go to the full brake upgrade with 13" rotors.

TAZ

[pdsq99f4]

Check the inside of the rear rotors. If they are really rusty they may need to be replaced or turned. Usually if a master cylinder goes out the pedal will go to the floor.

[dkhummerh2]

Check the inside of the rear rotors. If they are really rusty they may need to be replaced or turned. Usually if a master cylinder goes out the pedal will go to the floor.
Did you check your power steering pump? Miine went bad and I had the softness in the brakes. Replaced the pump and they were as good as new.
dk

[Cesardajr]

Well if it is your master cylinder i would see if this wilwood master cylinder would work. i have thought about it, but i dont think i need it right now.
http://www.wilwood.com/Products/006-MasterCylinders/009-ATCMC/index.asp
I just got some stainless steel braided brake lines from crown performance and need to install them to see how they improve my braking.

[Cesardajr]

As taz recommend a brake line upgrade is also good
these are the crown performance brake lines that i got from phil at trail duty

http://members.cox.net/cesartjr/Hummer%20Brake%20Lines%20010%20(Large).jpg:D

[ratesguy]

Thanks for the great replies! I will definitely go with the new brake lines and check the power steering pump. I had a brake job three months ago and went with a stiffer pad. Rotors were good. I do plan on keeping my rig until it crumbles around me. I ordered my rig in July 2002 and took delivery October 4th 2002. It was the first black special order rig delivered in Dallas (or so I was told).:jump: