That was scary! ABS brakes
Annie Deighnaugh
2 years ago
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2 years agolast modified: 2 years agoAnnie Deighnaugh thanked Zalco/bring back Sophie!Related Discussions
Bad Brake Vibration
Comments (4)Rotor thickness variation is a condition that can be imagined as the two sides of the rotor not being parrallel to each other. This can be caused by a "crushing" of the rotor by the brakes. It can be caused by uneven wear. Or it simply could have developed over time from a combination of forces. This problem is normally felt in the brake pedal by it pushing back at you with a rythm consistent with the current wheel speed. Rotor run-out is often caused by debris (rust) being caught between the new rotor and the old wheel hub, or by improperlly torquing the wheels, which can bend the hub, rotor and wheel. There is always a chance that excessive heat build up from heavy braking without sufficient time for the system components to cool is playing a role as well. This by the way is the most common cause for the report that we often see where a new car keeps having to get the rotors machined. It's not the cars fault, it is how the driver is using the brakes in heavy traffic! We also have rotor delamination, or rusting if you will. This causes a combination of runout and thickness variation issues. Typically rotor thickness variation of .002" is plenty to feel when driving. Otherwise you would have to use a dial indicator, and mark the high and low points on both sides of the rotor to see it. Rotor runout's of .005 or less will normally give no real signs they are present as the calipers of today have sufficient movement built into the system to "follow" the rotor. Between .005, and about .009 you will often feel the pulsation, but quite often you will hear the brake pads "saw" on the caliper supports as they get pushed back and forth. This "saw" is the grunting sound you get on a light brake pedal application as the car moves slowly such as 15mph or less. As I alluded to in the beginning of this response, a good technician does not even need to put a dial indicator on a car where the problem is rotor thickness variation. He/she will feel that right from the drivers seat. However, the technician DOES need to use a dial indicator, and measure wheel runout, then remove the wheel and (for most cars) put the lugnuts back on and measure rotor runout, then measure the front hub runout so that this problem is repaired the first time. Sadly this is one of the times where the good technician that does the job correctly needs to be paid to do so, yet the allure of the "free" brake inspection often prevents them from getting good at it because many are rewarded for being fast and getting the work in and out and as "cheap as possible" which in some occasions turns around and bites them for the effort. For the record, don't do "free" brake inspections, but I fix them....See MoreBrake Problems??
Comments (2)If the A.B.S. controler was at fault it will usually set a code. Not the case but your master cylinder will cause that problem. If your brake booster is leaking internally your engine vacumm will slowly apply the brakes. Only seen that once. i'd be looking at the master cylinder first....See Morebrakes dragging
Comments (12)The Matrix, one of the best series of movies ever. Now, watch this. You wrote "Prior to my initial state inspection I had taken the car to a garage (a national chain) and told them on at least two separate occasions (this year) that I think my brakes are low or mushy" Seized wheel cylinders, are reported to be the issue now for the difficulty installing the rear shoes correctly. Fact #1, fluid is incompressible, Fact #2 a seized wheel cylinder is a hydraulic dead end and that results in a hard pedal, not a mushy one. Hmmmmmm..... You wrote "I told them that I was kind of perturbed that they didn't find this problem during their earlier inspections. " A national chain. Let me guess, they do brake inspections for free, right? Need I say more about what free inspections are really worth? You wrote. "They became defensive and said that they didn't have the equipment to determine whether the cylinders were bad." That's absurd on their part (or at least on the part of the person you were speaking to) if they really said that. I work to explain how the industry functions when things are actually being done correctly, even when it does not seem apparent to the average vehicle owner that the shop is operating correctly. But some practices that many of the chains employ are in serious need to revision. I work from this side to try and get them to learn why their approach is often incorrect. Seriously, if they cannot identify frozen wheel cylinders, even if the symptom as described by the driver is completely opposite of what they would feel like, then they need to either attend more training, or get out of the trade. JMHO. I do two different eight hour continuing educational professional brake classes. One is a basic and the second one is for advanced ABS controls. I can't tell you how many times I get someone into one of those classes who have been doing brakes for a number of years that walks in the door thinking the class is below their experience, and I rock their world in the first half hour. Sadly, when I go and instruct for many of the chains I can teach the techs the mechanics of the business, but the management side is rarely in attendance in order to learn how to approach this area of service as professionally as it needs to be done. In short, free brake inspections are overpriced for their resultant value....See MoreWelcome to the scary pit that ate my kitchen.
Comments (16)Thanks for the comments. We started this on Friday and wrapped it up on Sunday evening. We knew before we opened the floor system up we were opening a can of worms. Every time we redo something on the house, we always anticipate it's going to be bad. No_green_thumb, yes .. we are the ones that just redid the upstairs for our daughters. Caroleoh, My DH is a builder, we own a log home construction company. Tx happy camper, we just redid our porch too, replaced 8 columns out front, they were in awful shape. I very much feel your pain, I hope your kitchen redo goes easy! Dlm2000, thank your DH for his critique. We live in an almost 100 year old home, so a dirt crawl space is common, especially here in the south. The house was neglected by the previous owners for decades, including no termite protection or maintenance of any kind. The joists were ate up by termites, which in turn caused rot, so are some of the sills we are replacing. It's pretty common to see PVC pipes down here rather than copper....See MoreFun2BHere
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