Motoring Q&A: Flushing brake fluid after 20,000 miles highly recommended

Motoring Q&A: Flushing brake fluid after 20,000 miles highly recommended
( MCT ) Q: Is it necessity to flush the brake fluid after 20,000 miles, as my Mercedes dealer recommends ? A: I recommend this routine avail for every centrifugal vehicle. Historically, domestic carmakers have n’t listed this as routine avail for their vehicles, but it has been, and continues to be, a recommend service for most european and performance cars. In fact, race cars are cook for every race with fresh brake fluent. Why ? moisture. Hydraulic brake fluent is a ethylene glycol ether-based fluent that is hydroscopic, meaning it has an affinity for attracting water. even the smallest amount of moisture contaminant in brake fluid can significantly reduce its seethe target.

This is critical because the characteristic of brake fluid that makes it appropriate for use in hydraulic systems is its incompressibility. There is no personnel casualty of force transmitted from the brake bicycle through the passkey cylinder to the caliper or rack cylinder. When fluid is contaminated with moisture, temperatures reached in the caliper or wheel cylinder can boil the moisture, generating flatulence bubbles in the fluid which are, of course, compressible. The symptom of this is a soft, slightly unpredictable brake pedal — not peculiarly confidence-building when trying to stop the fomite. Since some percentage of moisture concentration is convention over clock, a periodic flush and bleeding of the hydraulic system to replace any contaminate brake fluid is a identical good sustenance practice. In addition, removing moisture reduces rust and corrosion form in the brake system. Q: I have 125,000 miles on my 2001 Cadillac Eldorado. The determine engine unaccented came on a few weeks ago. The manual said it might be the natural gas crown. If the light is not flashing it normally is nothing serious. The dealer highly recommended a read to determine the problem. The read tool pulled up DTC P0741, which has to do with the overdrive not kicking in at higher speeds. They said a infection overhaul would cost between $ 5,500 and $ 6,000 but recommended I not have this work done because of the cost, the vehicle ‘s long time, that it will have no actual effect my everyday tug and is not a safety emergence. I was in truth impress that the dealer did not push for me to have this done, but wonder what your opinion is. A: I agree with your opinion of the dealer and the trader ‘s recommendation. According to my ALLDATA database, the P0741 fault code is set when the infection torsion converter clutch bag slip speed exceeds its limits for a specific engine torsion for more than five seconds. The cause can be adenine simpleton as contaminated or low fluent level, or that the transmission is operating in the blistering modality, which prevents date of overdrive. The dealer is correct, there is no safety issue and you can continue to drive the fomite. But I would suggest the KISS approach path — add a half-can of SeaFoam Trans-Tune to the transmission fluid, drive the car for several weeks, then have the transmittance fluid and filter changed. Q: I have a 2009 Chevy Malibu with the four-cylinder engine and 61,000 miles. After driving for about 20 minutes my RPMs rev up up and the cable car surges then goes spinal column to normal but the cycle keeps up. Please advise.

A: Because there could be therefore many possibilities, originate by checking fluid levels in the engine and infection. high engine or transmission function temperatures or depleted transmission fluent level could be the cause. Is the vehicle up-to-date on maintenance ? A restricted air out clean, exhaust system or a bare vacuum leak could cause this characteristic. Have a scan creature identify any store fault codes in the ECM or TCM. This may identify a trouble with the TCC — torsion converter clutch — mathematical process. If this occurs more frequently in warm weather at speeds in the 60- to 65-mph image, check with your principal. GM issued powertrain software updates that may address your issue. ——— ABOUT THE WRITER Paul Brand, writer of “ How to Repair Your car, ” is an automotive troubleshooter, driving teacher and erstwhile race-car driver. Readers may write to him at : Star Tribune, 425 Portland Ave. S., Minneapolis, Minn., 55488 or via electronic mail at paulbrand @ startribune.com. Please explain the problem in detail and include a day earphone total. Because of the volume of mail, we can not provide personal replies. ———

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Category : Car Brakes