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94 GMC sierra need advice on master cylender change and system flush


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truman252
User

Feb 24, 2012, 9:21 PM

Post #1 of 15 (2415 views)
post icon 94 GMC sierra need advice on master cylender change and system flush Sign In

94 GMC SIERRA 4x4 5.7 tbi auto trans 250,00mi.
The brake system is functional but in severe need of intervention. I. Checked the fluid level to find the resivare. With black contaminated fluid/front full back half full. I used a vacuum bulb to remove the contaminated fluid. Refilled with clean fluid.checked all hoses and lines for leaks. None found, hoses, lines, drums, rioters in fair condition. Shoes & pads at 25% remaining.
What I think I have is front & rear ABS. I bought a new master cylinder. This truck has two options. I got the code from the from the sticker in the glove box, and purchased the correct one..
What I would like is advice on the correct way to Purim the new master, and flush the entire system.


My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2012, 4:18 AM

Post #2 of 15 (2367 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

You use the word "contamination" pretty loosely. Is it truly contaminated and with what?

If this system saw even a couple of drops of anything with an oil base, then every part in the system that has any rubber in it will have to be replaced all at once. Contamination will wipe out an entire system nearly immediately.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
User

Feb 25, 2012, 4:33 AM

Post #3 of 15 (2360 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

My apologies. That is my mistake in wording. It looks like wear to the master cylinder causing a fine metal dust in the fluid. But that is a guess.no water or oil is apparent. It is very black and slightly fine gritty.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2012, 4:49 AM

Post #4 of 15 (2354 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Yes, you need to flush the system thoroughly. The best way would be using a pressure bleeder. You can flush it manually but if you get air into the ABS unit, you could have a real nightmare getting it back out because it requires a professional scan tool to bleed it electronically.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
User

Feb 25, 2012, 5:41 AM

Post #5 of 15 (2347 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Thanks for the information. I'm going to buy a pressure bleeder, and flush the system. I don't want to chance the air in the ABS. It's best to do things the right way the first time, rather than do them twice.
Ill post how it turns out in a few days. I appreciate your help.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2012, 6:41 AM

Post #6 of 15 (2342 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

It doesn't make much sense to buy a $500 tool to do one job when you can simply have a shop do it for you for likely under $100.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
User

Feb 25, 2012, 6:59 AM

Post #7 of 15 (2335 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

LOL your right about that. But I priced the non-comercial version and its only $80. It's worth the tool investment to me.
Unless you think the lower price version won't do what I need it to do. I'm not working in the feild, so high quality, durable bleeder isn't what I would need. I just enjoy doing my oun work if it is within my abilities.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2012, 7:43 AM

Post #8 of 15 (2330 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

I don't know what you could be buying for that price. I paid over $400 just for the adapters.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Feb 25, 2012, 7:43 AM)


truman252
User

Feb 25, 2012, 9:23 AM

Post #9 of 15 (2318 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Ill do a little research. I just done a search for pressure bleeder. It may not have the needed adapters.
ill take it to a shop to have it done by someone with the brake training I just don't have. As important as it is I want it to be done correctly. That's why I was asking a trained tech for advise as to the right way to do this. Thanks for the sound advice.
ill post what I find out about the pressure bleeder.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2012, 11:26 AM

Post #10 of 15 (2301 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Make sure you ask them specifically if they have a pressure bleeder. If you just say you want it flushed some unscrupulous guys will just add some fluid and bleed it a little to get your money.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
User

Feb 25, 2012, 4:03 PM

Post #11 of 15 (2285 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Thanks for the heads up on that. There are many excellent techs who are honest but there are a few mechanics who are not, and put a spot on the trade. I'm going to search shops in the area and read the reviews of there service record. / taken with a grain of salt of course. I have read some out of line complaints from cheep customers who wanted the shops to cut corners to reduce the cost. Most don't understand there is a safety issue, and the fix is temporary if not done correctly.
I'll make sure they have the equipment. Againe thanks for your help.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 27, 2012, 4:05 AM

Post #12 of 15 (2265 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Trueman: The honesty issue - that can and is any trade or place you spend any money for something. This trade gets a bad rap for some reason that messes with my head and always did. Not sure how that happened?

Fair is fair no matter what it is. First mistake is not trusting the judgment of a pro at whatever and they should be able to explain why - as a homeowner, mechanic and fellow human...............

Tom

(This post was edited by Tom Greenleaf on Feb 27, 2012, 4:07 AM)


truman252
User

Feb 27, 2012, 10:29 AM

Post #13 of 15 (2250 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Tom, you are right about that. It is with every trade, there are always bad apples. It's my opinion that you should trust the professionals, but try to be informed enough to be able to choose a professional that is knowledgeable about their trade.
Don't let the bad rap mess with you. You are one of the professional that are fixing the bad rap. There are customers that think they know best in all trades. Just because you pay for a service, don't mean you should get the work done the way you want it done. That's why there are professional tradesmen. Because the customer don't know how to do the work. The Rep of the auto repair industry is improveing.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 28, 2012, 5:48 AM

Post #14 of 15 (2236 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In

Thanks Trumam,

Tom


truman252
User

Feb 29, 2012, 7:03 PM

Post #15 of 15 (2218 views)
Re: 94 GMC sierra need advice on master cylender change and system flush Sign In


Quote

In my search for a non-shop grade pressure brake bleeder this is what I found for under $100.
Summit racing equipment. Motive products -0250 power bleeder kits $94.46 GM thread on kit. 2qt. Tank master cylinder. Lines, line adapters, pressure Gage. A look at the site will give a better break down. Many styles available.
I am in no way suggesting anyone buy this product and attempt to work on a brake system, unless you are a trained professional. I feel like Hammer Time gave me sound advice.
I looked for a local shop with a ASE certified brake tech.
Found a few and read some reviews of the shop. Then got a price quote to install my master cylinder and flush the brake system. I payed $135 and it only took two hours. That is from drop off to pick up..I'm happy with both and I'm comfortable knowing it was done by a certified brake tech.
Thanks for your help and advice. They also have a foreign car. Adapter $113. Once againe this is for DIY not shop grade equipment.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.






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