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  #13  
Old 07-20-2013, 10:53 AM
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Re: Wk pulsing while braking

Chris, mine don't look anywhere near as bad as yours appear to be (need those closeups), but I have just a few on each front. When I bought mine it had new front brakes (don't know if new rotors though), and I've got almost 40K on it since then.
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  #14  
Old 07-22-2013, 02:46 PM
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Here are some close up pictures, also I was going to bleed the brake , I sucked out the resovior and I got alot of sediment I got pics too this is the same fluid from the factory, will this sediment stop up a brake line

ForumRunner_20130722_154509.jpg



ForumRunner_20130722_154528.jpg



ForumRunner_20130722_154545.png



ForumRunner_20130722_154601.png
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Old 07-22-2013, 03:26 PM
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Re: Wk pulsing while braking

Thanks for the pix. Yours were much worse than mine are. You bet that crap can contaminate the whole system, especially the calipers. I think I'd be doing a complete flush and renewal of the fluid. Make sure you get the proper stuff though. What kind of sediment stuff is it? Is it hard or does it dissolve when rubbed between your fingers?

From the FSM:
BRAKE FLUID
The brake fluid used in this vehicle must conform to DOT 3 specifications and SAE J1703 standards. No other type of brake fluid is recommended or approved for usage in the vehicle brake system. Use only Mopar brake fluid or an equivalent from a tightly sealed container.


CAUTION: Never use reclaimed brake fluid or fluid from an container which has been left open. An open container of brake fluid will absorb moisture from the air and contaminate the fluid.


CAUTION: Never use any type of a petroleum-based fluid in the brake hydraulic system. Use of such type fluids will result in seal damage of the vehicle brake hydraulic system causing a failure of the vehicle brake system. Petroleum based fluids would be items such as engine oil, transmission fluid, power steering fluid, etc.

BRAKE FLUID CONTAMINATION
Indications of fluid contamination are swollen or deteriorated rubber parts. Swollen rubber parts indicate the presence of petroleum in the brake fluid. To test for contamination, put a small amount of drained brake fluid in clear glass jar. If fluid separates into layers, there is mineral oil or other fluid contamination of the brake fluid.
If brake fluid is contaminated, drain and thoroughly flush system. Replace master cylinder, proportioning valve, caliper seals, wheel cylinder seals, Antilock Brakes hydraulic unit and all hydraulic fluid hoses.


All the above being said, you may be able to "get away with" just the flush and new fluid, depending on what that stuff is. I would probably try that first and see how it goes, especially if it is "soft" material. If it's hard or gritty, for sure do as said above. That'll run some $$$ though. Hope you can save it.
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  #16  
Old 07-22-2013, 03:47 PM
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Thanks for the reply it disolves when you rub it, I was going to bleed the brakes the gravity fed way so not to get air in the lines and get all the fluid out put in new fluid I was going to use Valvoline dot3 dot4 synthetic brake fluid.
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Old 07-22-2013, 07:39 PM
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Re: Wk pulsing while braking

If it dissolves when you rub it, you'll probably be OK. Let us know how it goes.
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  #18  
Old 08-27-2013, 05:59 PM
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Re: Wk pulsing while braking

So I finally found time to do a runout check one of my rotors and is was 0.007. I'm pretty sure that's past the max tolerance but can anyone verify? The cheap dial indicator from harbor freight was such a pain in the ass to get right that I didn't even bother checking the others. The cost of buying a good quality American made one will cost more than having the rear rotors turned so that's probably what I'll do.
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Old 08-29-2013, 02:54 PM
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Re: Wk pulsing while braking

Runout spec is .002". You need to measure the hub runout too. The hub may have runout that wont be fixed with rotors. Realistically runout can contribute to braking concerns and can lead to a pulsation but runout by itself is NOT an indication that that is where your pulsation is coming from. Rotor parallelism as measured with a micrometer is what causes a pulsation. The pulsation comes from the thickness of the rotor not being even all around so it grabs-slips-grabs-slips... Runout will just cause the caliper to walk back and fourth on the slides but typically wont translate to any noticeable concerns.

When you did the runout you had run lug nuts back on to firmly hold the rotor evenly in place correct?
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Old 08-29-2013, 04:16 PM
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Re: Wk pulsing while braking

I replaced the lug nuts during the runout check. Since i'm returning the dial indicator to harbor freight and I dont own a outside micrometer I'm just gonna replace all four rotors with some R1 concepts or stocks, still havent decided. Not gonna bother finding out which ones are bad since I'd have to buy new tools. Thanks for the promp reply.
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Old 08-30-2013, 02:39 PM
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Re: Wk pulsing while braking

That will fix your problem!
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