Front Brakes Locked up after Recall

[wroc1]

A couple of months ago I had the brake recall done on my 2013 F6. Saturday morning I went for a ride. After 5 miles I was going through the gears just reaching 50 mph when my front brakes engaged. Talk about a wake up call. Pulled in clutch and nose dove harder. Dumped clutch and gases it to get off road. Had to bleed front left brake to get bike on trailer. Dealer couldn't find anything and blamed on slightly over filled reservoir which wouldn't have actuated brakes. Bike still at shop because I don't trust braking system. Anyone seen this before?

[stroguy]

Is this your first ride since the recall work?

[wroc1]

Is this your first ride since the recall work?

No. Have had several rides with no issue.

[stroguy]

I heard you the first time.

JK


I am no hydraulic specialist by far but the theory is simple and if you are not compressing the fluid the calipers should not squeeze the brake disc. So, if the caliper did not release from the last braking I could see a heat issue causing a partial freeze of the pad to the rotor.

There will be someone that knows way more than me to pipe up.

Larry?

[Wing'n it]

If there is too much fluid in the reservoir it sure could apply the brakes. If the fluid expands it has to go somewhere so if the system is overfull it will push past the master cylinder and put pressure on the system. Question is who overfilled it, the dealer that did the work?

[stroguy]

Is the fluid not heat stable to prevent that issue?

[Wing'n it]

Is the fluid not heat stable to prevent that issue?
To an extent it is but brake fluid needs room that why we have the rubber bellows under the cap, to seal out moisture but still let the fluid expand and contract. If you get brake fluid hot enough it will actually boil and cause brake fade or mushiness. If the system is too full it will expand and has to go somewhere and it would not take much on the F6 to be pushing on the rotors. Check the level in the reservoirs (clutch and brake) and you should see a "white floater" at the top of the window if you can't see it, it's too full.

[shooter]

If there is too much fluid in the reservoir it sure could apply the brakes. If the fluid expands it has to go somewhere so if the system is overfull it will push past the master cylinder and put pressure on the system. Question is who overfilled it, the dealer that did the work?

Exactly right. With every application of the brake the fluid gets hotter and expands. Once there is no air space left in the system it starts pushing the pistons out in the caliper. That makes more friction getting the fluid even hotter till what happens to the OP. Brakes can't apply themselves. Once the fluid level is adjusted it should be fine.

[shooter]

No. Have had several rides with no issue.

You have to remember we are deeper into the summer so everything is hotter. Fluid is hotter to begin with and road temps are hotter imparting even more heat into the system. I've seen this problem on automobiles many times. People that have their oil changed at quick lubes have this issue sometimes. The minimum wage idiot that tops off your fluid does exactly that. Fills the reservoir to the top. That master cylinder has a MAX line on it. It should never exceed that. It only takes approx a tablespoon of fluid to stop your vehicle.

[Steve 0080]

There is also a vent in the resorvior for over flow to escape in these type situations. However I have never heard of this happening.

[Wing'n it]

There is also a vent in the resorvior for over flow to escape in these type situations. However I have never heard of this happening.

Your right there is a vent, however it is on top of the bellows to allow air to flow in and out. Brake fluid is hydroscopic which means it will absorb moisture right out of the air ruining the brake fluid. The "vented" air can not get in and fluid can not get out past the bellows.

[stroguy]

This thread makes me warm. Thanks for the great input dudes.

[wroc1]

A lot of good information. Thank you. My concern is why now? Only rode a short distance that morning. Not sure how fast brake fluid heats up and expands. Again thank you.

[shooter]

Ambient temp may have been higher. If you were riding slow you won't get the cooling effect of the air movement at higher speeds. Or just lucky.

[Steve 0080]

What dealer did you go to....I think I remember you bought the bike in Deland? Call Gregg at Seminole Power Sports and run the story by him???


407-322-3253

[BIGLRY]

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[wroc1]

What dealer did you go to....I think I remember you bought the bike in Deland? Call Gregg at Seminole Power Sports and run the story by him???


407-322-3253

Purchased at Seminole. Recall performed at RC Hill in DeLand. I'll call him. Thanks.

[sabre85]

had a very similar experience with a vfr that has the same linked brake system that the 6 has. Too much fluid and a rebleed of the entire system was the solution.

[114th COBRA]

Thanks for the great input dudes.

+ 1 You guys on this site are one hellava asset. Learning something every time I get on. Bike education to the max. Keep on teaching. :clap2: