Is master cylinder seal bad & causing fluid to get black? - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 3rd & 4th Gen (1992-1996 & 1997-2001)/1st Gen Solara (1999-2003) Toyota Camry Discussion for years 1992-1996 & 1997-2001, as well as Solara discussion for years 1999-2003. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 23 Old 06-26-2019, 05:36 PM Thread Starter
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Is master cylinder seal bad & causing fluid to get black?

'96 Camry wagon, 4 cyl.
Not losing/leaking brake fluid but it turned black within a year after bleeding new fluid into system. My mechanic recommended I clean out the reservoir. As I was looking closer I noticed rust? around one of the seals per photo.

What should I do? Go ahead and clean the reservoir and add new fluid & bleed brakes?
No ABS brakes and can't find a new reservoir for veh. w/o ABS brakes.

Or do you think the one seal is bad and therefore cleaning the reservoir is just a waste of time? If so, I assume I'd need to buy a new MC.

I'm original owner. Veh not driven much but brakes have always seemed a little soft...

Thanks
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post #2 of 23 Old 06-26-2019, 05:55 PM
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RockAuto.com has master cylinders without ABS. Are you sure the fluid is dark? Suck some up with a cheapo turkey baster to see if it's dark. Sometimes that plastic reservoir discolors so bad, it makes the fluid look black.

The Stable:
'00 Camry (adult daughter's)
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post #3 of 23 Old 06-26-2019, 06:04 PM Thread Starter
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I will double check the fluid color tomorrow.

I am looking for just the plastic RESERVOIR. RockAuto has it as a category but the only product is for vehicles with ABS.

Thanks

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post #4 of 23 Old 06-26-2019, 06:11 PM
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Check the OE parts for your VIN at japan-parts.eu

If you pull the reservoir the MC will need to be bled anyway, consider buying the piston and internal seal kit and rebuilding the MC. I did a write-up a while back, check DIY section.

A lot of the times when the MC assembly is no longer available the rebuild kit is.

00 Camry 5S-FE 184k smoooth
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post #5 of 23 Old 06-26-2019, 07:09 PM
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x2 I found that most of the Gen3 brake part assemblies are no longer available from Toyota, but their rebuild kits are (and for brakes I'd only use OEM parts). The master cylinder rebuild kit is cheap, comes with all of the wear parts and it is super easy to do. The only special tool you need is a snap ring plier. When you buy the master cylinder rebuild kit also get a pair of the little grommets for where the reservoir connects to the master cylinder, and a gasket for between the master and the brake booster (you do not have to remove the booster, or anything from inside the vehicle, simply working under the hood unbolt the brake lines and the cylinder from the booster).

Get some lithium based glycol grease (if you buy a caliper rebuild kit it comes with a little ketchup package of it, or buy a tube from the dealer or auto parts store, the Toyota stuff is translucent pink color).

Lube up the bore, and the seals with it and reassemble. If the bore is corroded you can hone it with a auto parts store brake cylinder hone.

Just did this last week, to my '93.
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post #6 of 23 Old 06-26-2019, 07:57 PM Thread Starter
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So, I'm reading your replies to recommend I replace/rebuild the MC and not try to just clean the reservoir. right?

I do have the pink Toyota glycol that I use on the slider pins. I will consider rebuilding. RockAuto has ADVICS BMT021 {#4720107010, 4720133110} ADVICS Original Equipment Manufacturer.

Is it OEM?

The Japan auto parts site shows 47201-07010 -- http://japan-parts.eu/toyota/us/1996...cylinder#47201

Looks like 4720133110 is the updated part # and lowest price I found so far is over $200. https://parts.middletowntoyota.com/o...der-4720133110

Thanks

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post #7 of 23 Old 06-26-2019, 08:05 PM Thread Starter
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Lowest cost for rebuild kit # 04493 07010 is $66.

https://parts.lynchtoyota.com/oem-pa...ItMmwtbDQtZ2Fz

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post #8 of 23 Old 06-26-2019, 08:05 PM
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If this really is an Aisin part then good deal
https://www.ebay.com/itm/111155552002

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post #9 of 23 Old 06-26-2019, 09:58 PM
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Yeah, Aisin is OE on this generation Toyotas but Advics is an OE for Toyota so I would trust the Advics. In this era Toyota used Advics MCs on the high-end stuff (Lexus LS, stuff with e-brakes like the J100 2UZ Land Cruiser).

00 Camry 5S-FE 184k smoooth
01 ES300 147k NEEDS TRANS WORK
01 Insight 137k BROKEN CAMSHAFT
02 Insight 178k DC-DC BELLY-UP

08 STS-V 67k 570 RWHP!
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post #10 of 23 Old 06-27-2019, 06:18 AM
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Advics is a division of Aisin. I think it was recently spun off to be its own company (like, in just the last couple of years).
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post #11 of 23 Old 06-27-2019, 10:52 AM
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Quote:
Originally Posted by norm356 View Post
Advics is a division of Aisin. I think it was recently spun off to be its own company (like, in just the last couple of years).
Yeah; it was originally a joint venture between Toyota and Sumitomo IIRC. I like their MCs and their pads are good when it's the premium choice (like on late-model Corollas). Never did like Sumitomo pads on Subarus and larger Toyotas, they seem to wear out fast and make noise.
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00 Camry 5S-FE 184k smoooth
01 ES300 147k NEEDS TRANS WORK
01 Insight 137k BROKEN CAMSHAFT
02 Insight 178k DC-DC BELLY-UP

08 STS-V 67k 570 RWHP!
01 Viggen 112k 400 FWHP
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post #12 of 23 Old 06-27-2019, 04:01 PM
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Fluid gets dark usually mean the rubber is being attacked.

Given you don’t know the condition of the master cylinder casting, i’m More incline to get a new aftermarket MC, if available.

One member has a Gen 4 MC with rust in the bore. Not sure where that came into an aluminum bore?? No way rebuilding that.
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post #13 of 23 Old 06-27-2019, 05:37 PM Thread Starter
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Thank you, MacQ, for advising that I look closer at the fluid color. Initially I was surprised that it really wasn't pitch black like what I took out two years. But then I remembered that what I removed 24 months ago had been in there for 21 years and 117,000 miles. Whereas, today's photos are after only 2 years and 10,000 miles. With another veteran, John GD, agreeing with most of you to replace the MC, that's where I am.

I have one step in the MC replacement I'm not sure of but will first search for a better explanation before I bother you all again.
Thanks
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File Type: jpg brake fluid 6 27 19 a IMG_6609.JPG (118.9 KB, 8 views)

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post #14 of 23 Old 06-29-2019, 07:07 AM
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Quote:
Originally Posted by fred9x View Post
Thank you, MacQ, for advising that I look closer at the fluid color. Initially I was surprised that it really wasn't pitch black like what I took out two years. But then I remembered that what I removed 24 months ago had been in there for 21 years and 117,000 miles. Whereas, today's photos are after only 2 years and 10,000 miles. With another veteran, John GD, agreeing with most of you to replace the MC, that's where I am.

I have one step in the MC replacement I'm not sure of but will first search for a better explanation before I bother you all again.
Thanks
What step are you not sure about?
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post #15 of 23 Old 06-29-2019, 08:17 AM Thread Starter
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I was (am) concerned about "adjust length of brake booster push rod." Of course googling I did learn a lot about how the booster works. But the best advice/guidance was found right here on TN from JohnGD. He said just measure the pushrod seat in the master cylinder. If the new and old depths are identical then I skip pushrod adjustment. However, it's good to double check.


https://www.toyotanation.com/forum/1...995-5s-fe.html

So then I get to thinking that an oem MC would be the one to most likely have the same depth and I go back to looking online at the oem MC for $208 and the page shows the grommets available for $9 each. # 47255-16010. I ordered two and will just install them and clean the reservoir and bleed in Valvoline. easier (and cheaper) for this non mechanic. Yes, I understand that the new grommets may not stop the fluid from getting dirty but with one appearing to be leaking, I'm going to start with them.

https://www.toyotapartsdeal.com/oem/...255-16010.html

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