Rear Brake wearing fast
#1
Lexus Champion
Thread Starter
Rear Brake wearing fast
I just had my 90K service done at a local Lexus dealer. The rep called me and said that my rear brake pads were at 3/32". I didn't think much at the time and authorized the replacement over the phone. The brake function and parking brake checked out to be normal.
I do wonder, however, why my rear brake wore out so quickly? I don't abuse my brake, frankly I rarely use it for my commute.
For comparison, my front brake pads were replaced under warranty at 42K. And it went from 13/32" at 42K, to 9/32" at 60K, then 7/32" at 90K. The rear brake went from 12/32" at 0K, to 8/32" at 60K, then 3/32" at 90K??? The Lexus rep couldn't come up with any explanation himself. He acknowledged that it was strange.
Is there a possible cause for this? Thanks.
I do wonder, however, why my rear brake wore out so quickly? I don't abuse my brake, frankly I rarely use it for my commute.
For comparison, my front brake pads were replaced under warranty at 42K. And it went from 13/32" at 42K, to 9/32" at 60K, then 7/32" at 90K. The rear brake went from 12/32" at 0K, to 8/32" at 60K, then 3/32" at 90K??? The Lexus rep couldn't come up with any explanation himself. He acknowledged that it was strange.
Is there a possible cause for this? Thanks.
#2
Moderator
I assume we are not tlaking about auxillary brakes. Normally the front pads to rear pad life is 1:1.75
How is real time braking? If the front are not acting properly, then the rears end up doing the extra work. The other issue could be with the proportionating valve (very unlikely but possible)
First, do a brake fluid flush. Purge lines and slave cylenders from old fluid. Most brake problems are due to fluid not moving easily.
In an open parking lot or clear road, try various brake application. From slow to emergency braking.
As you lay down rubber, notice if the rears are more distinct.
Salim
How is real time braking? If the front are not acting properly, then the rears end up doing the extra work. The other issue could be with the proportionating valve (very unlikely but possible)
First, do a brake fluid flush. Purge lines and slave cylenders from old fluid. Most brake problems are due to fluid not moving easily.
In an open parking lot or clear road, try various brake application. From slow to emergency braking.
As you lay down rubber, notice if the rears are more distinct.
Salim
#3
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if you live in icy areas.. and you have vsc on then it might be wearing the brake pads out when it kicks in.. just a hunch cause mine wear out fast and I only noticed it when I move to IL from TX. I dunno.. might just be me though.
#4
Lead Lap
Just curious but,
did you have the front and rear calipers serviced at the time the brakes were done.
Inability for the slider pins to move freely on a floating caliper setup (which the Rx has) may cause excessive wear on the pad itself over the long haul.
Just a thought!
did you have the front and rear calipers serviced at the time the brakes were done.
Inability for the slider pins to move freely on a floating caliper setup (which the Rx has) may cause excessive wear on the pad itself over the long haul.
Just a thought!
#5
Lexus Champion
Thread Starter
I don't know whether Lexus serviced the calipers or not. No one but Lexus worked on my brakes. Front at 42K, rear at 90K.
I've had lots of wet and frozen weather during the last two months. The rear wheels always looked dirty. Is it possible that frozen water/road spray might get the calipers stuck?
And yes, VSC came on a couple of times due to ice, but just for about 3-5 seconds total.
My brakes have always worked well and stayed quiet. When should the wear indicator start screeching?
Thanks.
I've had lots of wet and frozen weather during the last two months. The rear wheels always looked dirty. Is it possible that frozen water/road spray might get the calipers stuck?
And yes, VSC came on a couple of times due to ice, but just for about 3-5 seconds total.
My brakes have always worked well and stayed quiet. When should the wear indicator start screeching?
Thanks.
#6
Moderator
Brake screecher should never be counted upon. If I recall correctly, the piece has to be trasnferred from the first brake pad on to the replacement pads. You end up hoping that mechanic has done that.
Nothing like inspecting the pads at each service interval.
There are are indirect ways, like rapid brake-pad dust collection as well as dropping brake fluid level.
Salim
Nothing like inspecting the pads at each service interval.
There are are indirect ways, like rapid brake-pad dust collection as well as dropping brake fluid level.
Salim
#7
Lead Lap
Doesn't mean this is your particular problem but just a co-incidence that I also had problems after brake service.
Again,
just a thought!
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#8
Moderator
That is why one needs to lay down the rubber in a parking lot to figure out what is happening or not happening.
Salim
Salim
#9
Lexus Test Driver
I just had my 90K service done at a local Lexus dealer. The rep called me and said that my rear brake pads were at 3/32". I didn't think much at the time and authorized the replacement over the phone. The brake function and parking brake checked out to be normal.
I do wonder, however, why my rear brake wore out so quickly? I don't abuse my brake, frankly I rarely use it for my commute.
For comparison, my front brake pads were replaced under warranty at 42K. And it went from 13/32" at 42K, to 9/32" at 60K, then 7/32" at 90K. The rear brake went from 12/32" at 0K, to 8/32" at 60K, then 3/32" at 90K??? The Lexus rep couldn't come up with any explanation himself. He acknowledged that it was strange.
Is there a possible cause for this? Thanks.
I do wonder, however, why my rear brake wore out so quickly? I don't abuse my brake, frankly I rarely use it for my commute.
For comparison, my front brake pads were replaced under warranty at 42K. And it went from 13/32" at 42K, to 9/32" at 60K, then 7/32" at 90K. The rear brake went from 12/32" at 0K, to 8/32" at 60K, then 3/32" at 90K??? The Lexus rep couldn't come up with any explanation himself. He acknowledged that it was strange.
Is there a possible cause for this? Thanks.
#10
Yes, rear brake wear faster on RX. I finally replaced my rear brake pad last week at 115k miles. My front brake pad still had 30% left. They last very long because I live in so. ca. and the mileage is 90% freeway and 10% city.
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