Problems after replacing master cylinder
in [Technical]
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From: Mark on 5 Apr 2010 21:33 Hi, I have a lexus es300 with 128K miles. I had taken my car to the mechanic as I felt the brakes needed work. I had to press the brake pedal all the way down to stop the car. The mechanic suggested replacing the master cylinder which I did. Now, I have 2 unique problems and I am looking for advice here to educate myself before I take the car back to the mechanic. 1. The brake pedal sometimes works just by a little pressing, and other times I need to press it all the way down. In other words, sometimes it brakes just by a slight touch of the foot and sometimes it doesn't. The brakes work, just that the "firmness" of the pedal keeps changing. 2. The car starts vibrating after driving for about 10 minutes on the highway. The vibration doesn't start right away. There is vibration in the car and the steering. When I brake, I get the pulsating feeling with the brake pedal. All the passengers in the car can feel the vibration. After about 15 minutes of driving, the vibration goes away and doesn't come back during the same ride. If I park the car, let it cool and drive again, then the same pattern repeats. Could the experts here give some insight into what the possible issues could be? The advice here has always helped me in the past and look forward to your opinion. Thanks and regards, Mark
From: jim beam on 5 Apr 2010 21:52 On 04/05/2010 06:33 PM, Mark wrote: > Hi, > > I have a lexus es300 with 128K miles. I had taken my car to the > mechanic as I felt the brakes needed work. I had to press the brake > pedal all the way down to stop the car. The mechanic suggested > replacing the master cylinder which I did. > > Now, I have 2 unique problems and I am looking for advice here to > educate myself before I take the car back to the mechanic. > > 1. The brake pedal sometimes works just by a little pressing, and > other times I need to press it all the way down. In other words, > sometimes it brakes just by a slight touch of the foot and sometimes > it doesn't. The brakes work, just that the "firmness" of the pedal > keeps changing. sounds like air in the system. needs to be bled by someone that knows what they're doing - your previous "mechanic" clearly doesn't. > > 2. The car starts vibrating after driving for about 10 minutes on the > highway. The vibration doesn't start right away. There is vibration in > the car and the steering. When I brake, I get the pulsating feeling > with the brake pedal. All the passengers in the car can feel the > vibration. After about 15 minutes of driving, the vibration goes away > and doesn't come back during the same ride. If I park the car, let it > cool and drive again, then the same pattern repeats. remove wheels, scrape all rust from the wheel mounting surfaces on brake disk. apply a LITTLE antiseize, making sure you get none on the disk, then re-fit the wheel with bolts being torqued with a proper torque wrench, in a two-stage sequence, and in the proper order. > > Could the experts here give some insight into what the possible issues > could be? The advice here has always helped me in the past and look > forward to your opinion. > > Thanks and regards, > Mark -- nomina rutrum rutrum
From: Tegger on 5 Apr 2010 22:07 Mark <muffi74(a)hotmail.com> wrote in news:e52c66b9-90a0-4583-a493- 0671bdd934d6(a)w17g2000yqj.googlegroups.com: > Hi, > > I have a lexus es300 with 128K miles. What year? Does it have ABS? -- Tegger
From: Mark on 5 Apr 2010 22:10 On Apr 5, 10:07 pm, Tegger <inva...(a)invalid.inv> wrote: > Mark <muff...(a)hotmail.com> wrote in news:e52c66b9-90a0-4583-a493- > 0671bdd93...(a)w17g2000yqj.googlegroups.com: > > > Hi, > > > I have a lexus es300 with 128K miles. > > What year? > > Does it have ABS? > > -- > Tegger Sorry, should have mentioned in my post. It is a '97 es300, and yes it does ABS.
From: Paul on 6 Apr 2010 01:18
Mark wrote: > Hi, > > I have a lexus es300 with 128K miles. I had taken my car to the > mechanic as I felt the brakes needed work. I had to press the brake > pedal all the way down to stop the car. The mechanic suggested > replacing the master cylinder which I did. > > Now, I have 2 unique problems and I am looking for advice here to > educate myself before I take the car back to the mechanic. > > 1. The brake pedal sometimes works just by a little pressing, and > other times I need to press it all the way down. In other words, > sometimes it brakes just by a slight touch of the foot and sometimes > it doesn't. The brakes work, just that the "firmness" of the pedal > keeps changing. I would suspect a bad vac booster - assuming it has normal vac boosted brakes and not boosted by power steering pump. > 2. The car starts vibrating after driving for about 10 minutes on the > highway. The vibration doesn't start right away. There is vibration in > the car and the steering. When I brake, I get the pulsating feeling > with the brake pedal. All the passengers in the car can feel the > vibration. After about 15 minutes of driving, the vibration goes away > and doesn't come back during the same ride. If I park the car, let it > cool and drive again, then the same pattern repeats. Could be tire(s) flat spotting when they sit. Could also be loose / worn suspension or steering parts. > Could the experts here give some insight into what the possible issues > could be? The advice here has always helped me in the past and look > forward to your opinion. > > Thanks and regards, > Mark |