Front brakes

john in la · Oct 28, 2017

We have a 2008 Toyota Yaris that my daughter uses.
I replaced the front brake pads in March by the store warranty records.
Couple days ago my daughter tells me there is a scraping noise from the front brakes.
So I took them apart today.

What I found has me stumped.
The inside pad is completely gone.
Not wore down GONE.
Pad; metal backing; whole brake pad.
The caliber piston is scraping against the rotor.

First thing to cross my mind is I forgot to put the pad in.
But that does not explain how it worked for 7 months with no problems.

Only thing I can think is the pad broke in half and fell out.
If that is even possible.

Any ideas???????????

DeltaRed · Oct 28, 2017

Bonnded(glued) linings, Not the first to let go. I lost a new bonded lining going down Monarch Pass once.Pretty scary,but thankfully no accident resulted.

juniur · Oct 28, 2017

What I?ve seen happen is caliper slide seized and only applied the inside pad. The inside pad wore down to the metal backing then that wore thin enough to come out of the pad holder. Yes it can happen. In our shop most vehicles get new pads calipers and rotors or we don?t warranty the brake job.
I have seen the rotors wear so thin the piston comes out of the caliper. It makes you wonder how long the ? noise ? was there.
If you had left the pad out the car would have pulled to one direction during braking. But I suppose most anything is possible.

SodBuster87 · Oct 28, 2017

I had a Chevy 1500 I borrowed my father. I came to a stop sign no brakes. Pads fell out of the caliper. Rotor came off in two pieces. Rotor literaly was literaly split in half.

Steve@Advance · Oct 28, 2017

Were the rotors turned? Checked for minimum thickness?

If the rotor was rough, it would have quickly worn the lining away. If it were below min thickness the pad could then fall out.

gab · Oct 29, 2017

I've seen a lot of the bonded lining separate from the metal plate and fall out but don't remember seeing the metal plate gone.

JF in MI · Oct 29, 2017

After 20 years in the brake business I have seen this (only one pad wearing) enough times. On that type of break system it is common for rust build up, in the slots where the pad slides, to get thick enough so that it is easy to insert the pads from the outside but after it moves inward enough it becomes jammed and won't retract. It overheats and burns up. If it continues the pad backing plate will become thin enough to simply fall out. On those types I always remove the caliper bracket to make sure the pads slide freely inside it and if not dress it with a file until they do.

Front brakes

john in la

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DeltaRed

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juniur

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SodBuster87

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Steve@Advance

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gab

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JF in MI

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