red rubber grease=pinkish brake fluid? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 19 Old 03-09-2019, 05:59 PM Thread Starter
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red rubber grease=pinkish brake fluid?

As the title states, my brake fluid is starting to turn pinkish in color. I observed this today looking at the sight glass on my master cylinder. A few hundred miles ago I replaced my 2 piston Tokico front calipers with a pair of Nissin 4 piston ones. I bought the Nissins used so I rebuilt them. In the rebuilding process I used Castrol Red Rubber grease liberally on the seals and pistons. I have read conflicting opinions on using this grease internally in the calipers. The brakes work quite well but I was concerned about the long term effects of this discoloration of the fluid. Has anyone else experienced this?

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post #2 of 19 Old 03-09-2019, 06:41 PM
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I replaced my 2 piston Tokico front calipers with a pair of Nissin 4 piston ones. I bought the Nissins used so I rebuilt them. In the rebuilding process I used Castrol Red Rubber grease liberally on the seals and pistons.
I have rebuilt brake calipers but not specifically the Nissins you reference. If the brake fluid is mixing with grease you used, and it is compromised, I would advise flushing the brake system with new, clean fluid. Then keep an eye on it to see if it turns pink again anytime soon.
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post #3 of 19 Old 03-09-2019, 06:59 PM Thread Starter
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If the brake fluid is mixing with grease you used, and it is compromised, I would advise flushing the brake system with new, clean fluid.
I'm sure that the red grease is mixing with the brake fluid and turning it pinkish. But I understand that this grease is perfectly compatible with brake fluid and the grease is red because of a dye. At some point I will probably flush out the pink but is there a reason to be concerned at this point? Does anyone know if the fluid truly is compromised and is prevented now or at some point in the future from functioning normally?

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post #4 of 19 Old 03-09-2019, 10:16 PM
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"CASTROL RED RUBBER GREASE

A rubber compatible grease formulated to be compatible with natural rubber components in a range of cars, light commercial vehicles and any other vehicle using rubber components, particularly brakes and clutch hydraulic mechanisms

Application

Specifically formulated for rubber to rubber lubrication where any effects such as hardening or swelling of the rubber must be avoided. It therefore can be used on automotive hydraulic brake and clutch components where compatibility with natural rubber and SBR seals are involved. It may also be used to assist the assembly of natural and synthetic rubber components for automotive brakes or clutch systems and suspension units."

So no, there should be no adverse effects, but, Castrol makes no claim of long term compatibility with brake fluid.

I would change the fluid, just to be safe. Perhaps you "liberally" applied a little too much grease.

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post #5 of 19 Old 03-09-2019, 10:51 PM
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I have never, and would never use anything other than the specified clean brake fluid for caliper, wheel cylinder, brake or clutch master cylinder internal seals.
I have seen some use rubber grease for the dust boots on those components, but never on any internal seals where contact with brake fluid could occur.
I have a tube of that red Castrol rubber grease in the garage, probably over 35 years old by now. Long enough to forget why I bought it in the 1st place.
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post #6 of 19 Old 03-10-2019, 01:11 AM Thread Starter
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Yeah, I'm not sure why I got it into my head that I should use this lube in the first place. First time I used anything but brake fluid in the reassembly of any brake component. I guess I should be glad that I didn't purchase a gallon tub.
I didn't have any at the time but I could probably have used a bit of this lube when I replaced the cooling system hoses on my SV. One or two of those hoses were a pain slipping over the nipples.

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Last edited by derj; 03-10-2019 at 01:18 AM.
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post #7 of 19 Old 03-10-2019, 01:12 AM
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Maybe to put between your brake linings and the drum or rotor to reduce rolling resistance when you’re not using the brakes? (Ducks for cover)
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post #8 of 19 Old 03-10-2019, 12:55 PM Thread Starter
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I'm not trying to rationalize using the red stuff (I'm still going to flush out the pink brake fluid) but in attempting to learn about it I came across this:What is Red Rubber Grease, such as Castrol and Girling, why and how it is used for hydraulic brakes, clutch and suspension lubrication. Technical information and selected applications.
Anyone care to comment on the information contained in the article?

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post #9 of 19 Old 03-11-2019, 01:23 AM
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Your article effectively describes RRG as an assembly lube and a preservative of rubber parts that are exposed to the air. Just the lightest smear should be all that is required.

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post #10 of 19 Old 03-11-2019, 03:19 AM
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Hey what's wrong with PINK????? I bet some of the ladies thinks it's very MetroSexual of you..... LOL just poking fun..... LOL

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