Hi new to join this site so please excuse me if I didn't post in propper area. Recently I purchased a 2000 land cruiser with 148,000 miles. It came with 275/70/16 Michelin LTX m/s that were very worn. I drove it about 500 miles then put a set of bfg all terrain 265/75/16. 2 were new and 2 were slightly worn 4/64 difference between the two. Newest 2 on front axle. Approx 1 week later I noticed brake fluid leaking near master cylinder. Prior owner had replaced 2 lines from master cylinder still has Toyota sticker on them. My pedal is tight, no noises. No leaking on firewall. No leaking by abs moduale. No leaking by accumulator. No leaking from lines. Leaking under master cylinder or on top somewhere. Very small amount. Would a master cylinder rebuild fix this even though my pedal is tight? Did I create my own problems with slightly mismatched tires?
brake fluid leak from? did I make a problem
- Thread starter sean2202
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2001LC
SILVER Star
I don't think those tires would have anything to do with leak at master. I'd clean master and area really good and see if leak still there. May be spillage from PO topping.
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It's possible the reservoir was overfilled and fluid has puked out. The level is suppose to be set after the brake accumulator pressure has been bleed with 40 brake pedal pumps with ignition off. The level actually changes about 1/2 inch between accumulator charged/discharged. If there's no warning lights or buzzers and you're stopping well then I'd just clean it up, set the level correctly and monitor.
To make sure the reservoir isn't overfilled: With the truck off, key out of the ignition, pump the brake pedal 40 times. That will get the brake fluid out of the accumulator. Now make sure the fluid isn't past the max line on the reservoir. When you start the car the accumulator will run for around 35 seconds taking the fluid back.
Phat-
Phat-
- Thread starter
- #5
OK thank you for the replies. No lights are on even under heavy pressure. I did notice fluid was slightly low then pumped 40 times and fluid was at max level. I did this again to relive pressure on system after driving and it still had a small leak somewhere. Possibly overfilled when replaced lines? It has also been really cold here 10degrees to 30 degrees. Is there seals under reservoir that leak or dry out?
There are three rubber grommets that seat the reservoir into the MC. It's possible for one or more of them to be a point of failure and they would be a good first place to look based on where you said the fluid is coming from.
For pulling the MC, look at the thread on the MC rebuild DIY by Skidoo. You'll have it out in no time. Of course, you'll have to bleed your brakes from scratch after you put it back in. Order the grommets then pull it apart for a looksie.
Phat-
siuml-posted the fluid level proceedure. PADDO beat me to it!
For pulling the MC, look at the thread on the MC rebuild DIY by Skidoo. You'll have it out in no time. Of course, you'll have to bleed your brakes from scratch after you put it back in. Order the grommets then pull it apart for a looksie.
Phat-
siuml-posted the fluid level proceedure. PADDO beat me to it!
probably over fill had a similar leak also after car was at dealership and they washed it; tech guy told me they sometimes press brakes to many times and it causes the res to spill out. leak was behind driver side front tire along wheel well. no leak from then has been like 6 months etc keep and eye on it or try to clean up leaked fluid then watch if any more leaks
I found the smaller (middle) grommet to be leaking... Replaced all three for about 26USD.
p/n:
3141735010 (1x)
4725516010 (2x).
Resolved the issue entirely, took about 10m to complete the task, including a thorough wash down of the bay.
Cheers!
p/n:
3141735010 (1x)
4725516010 (2x).
Resolved the issue entirely, took about 10m to complete the task, including a thorough wash down of the bay.
Cheers!
Just wanted to chime in for posterity for future google searches.
After replacement of pump motor and accumulator, the shop bled the brakes and it came back with a pretty significant leak, also coming from the middle grommet.
I'm gonna have to take the reservoir off again, check the grommet, check for small cracks in the reservoir itself, and replace the grommet probably.
It's a cheap part, easy to replace, just gotta spill a bunch of brake fluid taking the reservoir off.
My reservoir is massive, it's the hzj105r Aussie version with ABS. Can't find anywhere that sells the reservoir on its own. Might have to repair any cracks.
I'll report back to update for future people searching.
Hi,
I just stumbled across this amazing forum and thread whilst looking for some help with my Toyota Granvia 3.0 diesel (KCH10W), 1997.
I have a very similar brake cylinder/booster assembly, which seems to have leaking grommets (between the reservoir and cylinder) but the vehicle is old and the brake bleed nipples are very corroded. I could scrub them down and try and loosen them but I'm concerned about breaking the nipple off so would rather not have to bleed the lines.
Does anyone know if it's possible to remove just the reservoir, replace the grommets and then replace/refill the reservoir and not have to bleed the system - or would doing this risk introducing too much air so a bleed is always needed?
Sorry if this is a dumb question but I'm an absolute novice and finding a mechanic in Scotland familiar with Toyotas isn't easy.
Many thanks,
Damian
(Also - would love to know if anyone has done this on a Granvia engine without detaching the cylinder assembly? space looks quite tight above the cylinder - but i'm hoping it might be possible.)
I'm responding to this to see if someone can answer. I am in pretty much in the exact boat with a brake fluid leak. Booster was replaced a year ago and my pedal feels firm and works without an issue. Others pointed me in the direction of the MC grommets as well but I don't know if you have to take off the entire MC to change them or not.
