brake wear light?

sniperman

hi again folks,im about to put new pads and discs all round on my 2016 rav4,is there a break wear light on them,and if i do the job myself will i have a light on the dash when im done or not,any tips/advice welcome thanks

BlakeS94

Brake pad sensor works the same as the piece of metal that sticks out when pads are low enough to need changing, the sensor picks up that the pads material is low and sets off the light on the dash.

New brake pads should come with a new brake pad wear sensor, usually I think its just 1 sensor per axle, so you'll see if its on the drivers or passengers side when removing the wheels.

A new sensor will reset the light on the dash automatically as far as I know.

Take note of what way the sensor is routed and make sure to put the new one in the same way.

The sensor itself at the end goes onto a little cutout on 1 of the pads

jmreire

https://www.boards.ie/discussion/2058232058/brake-wear-light

Dont get me wrong, but have you done this job before? If you have, and its only a question you have about the sensor, then you'll be fine. If not, then do a little research first..after removing the old brake pads, the caliper pistons have to be moved back into their sockets to allow for the increased width of the new pads, and that sometimes means loosening the brake bleed screw, to allow the calipher to move backwhich means having to bleed the brakes afterwards. But let us know anyway, if you have proiblem, OK ?

BlakeS94

Yes but that's a BMW where everything must be reset by electronic means. I believe on most cars that once you put in a new sensor, the light will automatically reset, maybe after a drive cycle.

https://www.boards.ie/discussion/comment/118603370#Comment_118603370

Why you open the bleeder at all? If there is no monkey business, the reservoir should have enough space and do not mess with bleed screw. Honestly it is such a bad advice to touch the bleed screw because if you damage it, you have bigger fish to fry. If you do not have a caliper compressor/computer, buy or rent it.

I did not say the brake bleeding is bad, just do not mess the things what is not necessary for that job.

Dirty Nails

https://www.boards.ie/discussion/comment/118604625#Comment_118604625

The only really bad advice here is telling people to force fluid backways through a master cylinder.

What should they do when the seals get inverted?

sniperman

https://www.boards.ie/discussion/comment/118603370#Comment_118603370

thanks all for comments,hi jmreire,i have done brakes on older cars that dont have all the tec that they do now,and have a fair idea how to go about it,ive not done any cars with this ware sensor bit,ill have a go,and if the light does come on,im hopeing it can be reset,thanks

jmreire

https://www.boards.ie/discussion/comment/118605073#Comment_118605073

You will be fine so, just maybe blow any dirt or grit away from where the sensor goes, and you will be fine. All the electrics will be switched off during the job anyway so, no settings disturbed. And unless the disc warning icon was on before you started the job, nothing to worry about, ( and even if it was, the new disc's should take care of that. Good Luck with it.

https://www.boards.ie/discussion/comment/118605005#Comment_118605005

Are you really fool or only playing it? I never ever seen before something like so stupid.... Follow the manufacturers guideline if you are so scared to get seal inverted... You really believe your garbage? By your theory the seal should be inverted every time when you release the brake pedal - fluid returns to the reservoir ... Please, come back on 1st April.

Dirty Nails

https://www.boards.ie/discussion/comment/118605316#Comment_118605316

With every post you make,it becomes more obvious that there are lots of things you havent seen.

You know nothing about master cylinders either if you think that there should be back pressure on them.

Difference between us is that I know - you spoof. I just don't need to impress anyone with my knowledge.

https://www.boards.ie/discussion/comment/118605497#Comment_118605497

I took 5 minutes specially to read that car brake service procedures and there was not any warnings about "inverted seals".... I never seen such a thing. So, please enlighten us all, how the seal can be inverted. I really did not know that, using the car brakes can be such dangerous event... Sure, I invented that last part because you said "force fluid backways through a master cylinder.

What should they do when the seals get inverted?"

Actually I give that invention all to you, be nice and shine bright.

Or you can educate us all. I really like to know more about that. Like I learned just short time ago, how much toyota engineers like to use tape on screwdriver...protection is good, no more scratches

Dirty Nails

https://www.boards.ie/discussion/comment/118605694#Comment_118605694

You being master mechanic, It's sad that I have to explain this to you but here goes.

Seals can & have been inverted where fluid is forced back faster than the return valve in the master cylinder can take it (By pushing the caliper piston back too fast).

If you're unfortunate enough for it to happen,the cure is : 1 remove master cyl. 2 throw in rubbish. 3 replace master cyl & so on. Quickly turns a simple job into a big job.

The proper process is use brake bleeding bottle,loosen nipple,push back piston & tighten nipple. No bleeding necessary & the brake fluid reservoir isn't overflowing.

That's first year apprentice stuff,you shouldn't have to consult a manual for it.

https://www.boards.ie/discussion/comment/118606004#Comment_118606004

Ok lets make a new thread, because that story is really worth it.

Dirty Nails

“Never argue with an idiot. They will drag you down to their level and beat you with experience.”

― Mark Twain

jmreire

And in this case, you have the right conclusion.

You can hide to smart dead person shadow, you`ll joining him soon.

---LCM 2022

CoBo55

https://www.boards.ie/discussion/comment/118606004#Comment_118606004

One extra tip is to clamp off the Flexi hose with a hose clamp. He obviously has never done pads on an Opel, master cylinder flipping seals was their party trick.

Dirty Nails

https://www.boards.ie/discussion/comment/118611146#Comment_118611146

Opels were what came to mind when I posted about the seals.

When you mentioned brake hoses - collapsing brake hoses were another opel party trick

BlakeS94

Taken from the Haynes manual of bad advice