Tyres, Brakes and Suspension » How much DOT4 fluid?

R1200RS + R1250RS Forum � 1200 RS technology � Tyres, Brakes and Suspension � How much DOT4 fluid?

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#1 | How much DOT4 fluid? datum

Sat Dec 23, 2023 11:49 am (Last edited: Sat Dec 23, 2023 2:21 pm)

I was getting ready to do a brake flush on the RS. I have a bottle of synthetic DOT4 fluid, but it�s 12 ounces (354ml). This is enough for what I normally do for a brake flush, and I had leftover fluid from the last time I did this.

However, I want to do the ABS purge with the GS911 tool, and that calls for 3 manual flushes (before 1st purge, after 1st purge, and after 2nd purge). I fear 12 ounces will not be enough. Anyone know how much I should have on hand?

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#2 | RE: How much DOT4 fluid? datum

Sun Dec 24, 2023 2:18 am

I did the same last spring, and I forget how much I used, but I had an extra 12oz bottle on hand.

2020 R1250RS

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#3 | RE: How much DOT4 fluid? datum

Sun Dec 24, 2023 11:46 am

I went to town and bought the big bottle because I�m on the road today and everything will be closed on Christmas Day, and I will use that. I hate waste, but what the price difference is between a small bottle and a big one, if you need more than two it�s just cheaper to buy the big one. At least I can be liberal with the fluid as I�m not in danger of running out mid job.

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#4 | RE: How much DOT4 fluid? datum

Mon Dec 25, 2023 7:10 pm

I hope I didn�t screw up, but I think I did. The front calipers have a bleed screw inserted into a larger screw where the banjo bolt attaches to the caliper. I accidentally loosened the bigger one and had fluid rundown the caliper.

Will this necessitate having to replace the brake pads or can I just clean it all off with a healthy amount of brake cleaner?

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#5 | RE: How much DOT4 fluid? datum

Mon Dec 25, 2023 7:29 pm

Zitat von zer0netgain im Beitrag #4
I hope I didn�t screw up, but I think I did. The front calipers have a bleed screw inserted into a larger screw where the banjo bolt attaches to the caliper. I accidentally loosened the bigger one and had fluid rundown the caliper.

Will this necessitate having to replace the brake pads or can I just clean it all off with a healthy amount of brake cleaner?

I did the same thing the last time I changed my brake fluid. As I recall, I just re-tightened the larger screw and continued to replace and bleed the brake fluid in the usual method. Then I cleaned the brake caliper and wheel rim with alcohol. The finish on the caliper and wheel rim was not affected. But it was difficult getting all of the brake fluid out of the crevices on the caliper, but an old toothbrush and a rag will work to clean the caliper surface. The fluid did not get on the brake pads which might have caused a problem.

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#6 | RE: How much DOT4 fluid? datum

Mon Dec 25, 2023 8:33 pm

The job is done. Measuring all the wasted fluid�about 4 to 5 ounces. I�m rather surprised by this, but the brake lines are short and narrow.

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#7 | RE: How much DOT4 fluid? datum

Thu Dec 28, 2023 3:34 pm

Zitat von zer0netgain im Beitrag #4
I hope I didn�t screw up, but I think I did. The front calipers have a bleed screw inserted into a larger screw where the banjo bolt attaches to the caliper. I accidentally loosened the bigger one and had fluid rundown the caliper.

Will this necessitate having to replace the brake pads or can I just clean it all off with a healthy amount of brake cleaner?

You'll be fine. Just make sure you wash the fluid off.

2020 R1250RS

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