rebuild brake master ?

[3bears]

Ive searched and even youtube to see if anyone has rebuilt their brake master cylinder instead of replaceing....this is for the older non electric one...as used on my 2000.
Or anyone used a Napa new one with luck.

Reason I ask....is in my 4runners past life it did get the TBU by previous owner...but no idea on how long ago....and it is time to replace.
I had all the parts , rotors, master and check valve from yota, calipers from Napa, stop tec stainless brake lines, as well as new yota rear cylinders and stainless hose.

but thanks to some ass-hats ( https://www.toyota-4runner.org/3rd-gen-t4rs/304733-start-over-thanks-thieves.html) all those parts and all my tools are long gone as of a few weeks ago.

So Im on a budget....thus my thoughts on rebuilding my master to save a few bucks....or just go new napa for only about 30 more than the yota kit.
the yota master is at 200....but trying to save where I can

plus this summer I have to do timing belt kit, front wheel bearings and vc gaskets....most of that was yota also...but they took that stuff too. Insurance and deductable is way high for replacing that stuff

thanks

 

[brillo_76]

The non electric ones are rebuildable. Sadly the last one I did was in a 1983 4x4.

On my 97 I had only leaking reservoir grommets so I only replaced those and I am in good shape.

Which tundra upgrade do you have the 199 mm rotots or the larger ones?

Sent from my SM-A505U using Tapatalk

 

[3bears]

The non electric ones are rebuildable. Sadly the last one I did was in a 1983 4x4.

On my 97 I had only leaking reservoir grommets so I only replaced those and I am in good shape.

Which tundra upgrade do you have the 199 mm rotots or the larger ones?

Sent from my SM-A505U using Tapatalk

did you mean 199 calipers ? Arent the tundra rotors all the same ?

it is the larger ones, brake pedal does not feel soft or spongy. I noticed months ago that pads were pretty low, that the rear shoes were looking low, and I have no idea when the rig was converted to the TBU so no idea if at the time if used calipers etc were used. The person I bought it from only owned for two years and he said he did not touch the brakes. So I just want to replace all and the hoses and just thought I would do the master while at it.
i have read that some people have soft pedals with the larger calipers and not with the smaller ones, my first one that had the larger did not have a bad pedal.

 

[brillo_76]

did you mean 199 calipers ? Arent the tundra rotors all the same ?

it is the larger ones, brake pedal does not feel soft or spongy. I noticed months ago that pads were pretty low, that the rear shoes were looking low, and I have no idea when the rig was converted to the TBU so no idea if at the time if used calipers etc were used. The person I bought it from only owned for two years and he said he did not touch the brakes. So I just want to replace all and the hoses and just thought I would do the master while at it.
i have read that some people have soft pedals with the larger calipers and not with the smaller ones, my first one that had the larger did not have a bad pedal.

All I use are the 199mm rotor tundra wide caliper and wide rotor as everything basically the same. Except the wider rotor. They fit the stock rims etc. Same pedal feel.

The issue may come in the the larger I think 231 mm rotors as these larger ones don't fit the stock 16 inch rims. Plus thet have different size caliper pistons if I am remembering correctly. These larger pistons can change pedal feel. As members have reported. For me it was only to get rid of my warping issues. These smaller tundra calipers will do that. You can see on my build thread as I compared the stock to the small tundras.

Sent from my SM-A505U using Tapatalk

 

[spartacus]

The brake master cylinder kit 04493-30232. There are Aisin brakecylinder rebuilt videos on line.

 

[3bears]

thanks....i grew up in the day when you rebuilt things...not throw away. I have rebuilt endless numbers of master cylinders, slave cylinders, calipers and wheel cylinders. In the day dealers and aftermarket sold rebuild kits.
so was jut curious if anyone has rebuilt their 4 runner master.
and like I mentioned above...you can buy aftermarket brake masters for the cost of the yota rebuild kit...and if you want to go real lowball...you can get complete masters for less than the rebuild kit.
but the aftermarket complete masters....how long do they last....are napa any good ? yes I know the line....lifetime warranty....first...how many times do you want to keep doing it....like if master fails in a year or so.....do you enjoy replacing every few years....im tired of doing that....also....lifetime...well history shows many people dont own cars past 4 years b4 getting a different one.

 

[nissanh]

kit

You can rebuild it. Seiken also makes repair kit for toyota.

There are two pistons in the brake master cylidner. There is a bolt on the side, that holds the inner piston, remove it along with the copper washer/gasket. Install new repair kit and then reinstall the bolt and then slide the 2nd piston. That's it.

Below is the kit for my 97 4unner:

 

[HiluxSurf SSR-G]

the 1999-2006 Tundra had only one brake rotor size. But there were two calipers sizes, the 199mm calipers for the 1999-2002 and the 231mm upgrade calipers. the 231mm calipers also had bigger brake pads.
i have done replacing the pistons in the master cylinder using the Toyota MC repair kit

All I use are the 199mm rotor tundra wide caliper and wide rotor as everything basically the same. Except the wider rotor. They fit the stock rims etc. Same pedal feel.

The issue may come in the the larger I think 231 mm rotors as these larger ones don't fit the stock 16 inch rims. Plus thet have different size caliper pistons if I am remembering correctly. These larger pistons can change pedal feel. As members have reported. For me it was only to get rid of my warping issues. These smaller tundra calipers will do that. You can see on my build thread as I compared the stock to the small tundras.

Sent from my SM-A505U using Tapatalk

 

[brillo_76]

My 2 sets actually came off 2 sequoia's that I had rebuilt or replaced the piston o rings and dust covers on. as certain years of those also use the 199 mm wide rotors and calipers.



Sent from my SM-A505U using Tapatalk

 

[3bears]

You can rebuild it. Seiken also makes repair kit for toyota.

There are two pistons in the brake master cylidner. There is a bolt on the side, that holds the inner piston, remove it along with the copper washer/gasket. Install new repair kit and then reinstall the bolt and then slide the 2nd piston. That's it.

Below is the kit for my 97 4unner:

thanks.
from the picture it looks like it does not have the seals that go between reservoir and body of master , those two add another 20 to the job that brings the price of kit and those two seals to $87. With NAPA current sale I can get a complete master with resevoir for 84. Of course how good is a new napa compared to a rebuilt yota one.....hmmm

 

[brillo_76]

thanks.
from the picture it looks like it does not have the seals that go between reservoir and body of master , those two add another 20 to the job that brings the price of kit and those two seals to $87. With NAPA current sale I can get a complete master with resevoir for 84. Of course how good is a new napa compared to a rebuilt yota one.....hmmm

Napa is mostly decent. I doubt it the same quality as oem. However, most of their parts are not bad. All thst can go bad in the master cylinders would be those and the grommets I changed on mine.

Unless it's all pitted up inside. Just like your calipers and wheel cylinders. I just rebuild them with new seals and a little Emory cloth if need be.

Sent from my SM-A505U using Tapatalk

 

[3bears]

Napa is mostly decent. I doubt it the same quality as oem. However, most of their parts are not bad. All thst can go bad in the master cylinders would be those and the grommets I changed on mine.

Unless it's all pitted up inside. Just like your calipers and wheel cylinders. I just rebuild them with new seals and a little Emory cloth if need be.

Sent from my SM-A505U using Tapatalk

thanks....another old school person like me...thanks bud

 

[sleepydad]

thanks....another old school person like me...thanks bud

I did my 2000, notice the new seals do not match the old ones... so Toyota changed out the seal config at some point.

https://www.toyota-4runner.org/2885174-post29.html

 

[brillo_76]

I did my 2000, notice the new seals do not match the old ones... so Toyota changed out the seal config at some point.

https://www.toyota-4runner.org/2885174-post29.html

Sleepy, did you have to change the resovior 2 bottom grommets when you rebuilt yours? I actually had those start to seep on a 1997 limited.



Sent from my SM-A505U using Tapatalk

 

[sleepydad]

Sleepy, did you have to change the resovior 2 bottom grommets when you rebuilt yours? I actually had those start to seep on a 1997 limited.
Sent from my SM-A505U using Tapatalk

pretty sure I did everything on my 2000 including grommets. the truck spent the first 15 years of it's life in a hot dry climate so everything rubber was hard and cracked. after 20+ years things do wear out.

 

[brillo_76]

pretty sure I did everything on my 2000 including grommets. the truck spent the first 15 years of it's life in a hot dry climate so everything rubber was hard and cracked. after 20+ years things do wear out.

Yes that's them. Those are all I changed on any 3rd gen master cylinder thus far. I do know it's just a matter of time before my pedal creeps to the floor though....

Sent from my SM-A505U using Tapatalk

 

[Toya!]

I did my 2000, notice the new seals do not match the old ones... so Toyota changed out the seal config at some point.

https://www.toyota-4runner.org/2885174-post29.html

Perhaps you got the rebuild kit for the non abs master cylinder?

I do know there are different MCs depending on if your rig came with ABS or not so I would assume the rebuild kits should reflect those

 

[sleepydad]

Perhaps you got the rebuild kit for the non abs master cylinder?

I do know there are different MCs depending on if your rig came with ABS or not so I would assume the rebuild kits should reflect those

There is only one rebuild kit part number for my vin. Toyota does update parts as time goes on. We know the rear axle seals were changed at some point.

It’s been a couple of years now and those newer style of seals work just fine.

But I agree anything is possible.

 

[HiluxSurf SSR-G]

the non-ABS MC is markedly different from the ABS MC. The non-ABS MC is single tube and has a nozzle to accommodate the return line from the LSPV.

Perhaps you got the rebuild kit for the non abs master cylinder?

I do know there are different MCs depending on if your rig came with ABS or not so I would assume the rebuild kits should reflect those

 

[JZiggy]

Do you guys have any opinion on the Advics (Aisin) replacement compared with rebuilding OEM? My non-ABS OEM unit is still working fine, but at 300k it's only a matter of time. The Advics one is only $65...