Brakes feel crazy soft during rain

[King_Ch1cas]

Anybody else have it where you have to stomp your foot all the way down to get your car to stop? This only happens in the rain for me though. I have Akebono brake calipers with slotted rotors (brake pads unknown since I bought her used)
. Probably just have to bleed my brakes or do you guys think it's something else? Thanks guys

[eliboy]

Did you checked your tiers? I am asking it because you are saying it only happens in rain.


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[King_Ch1cas]

Originally Posted by eliboy

Did you checked your tiers? I am asking it because you are saying it only happens in rain.


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Yeah just checked them, they have a lot of great left and it doesn't feel like the car is sliding

[Halfkiddio]

Rain will cause the pads to work slightly harder to do the same stopping force. I would suggest flushing the fluid and seeing how it feels after. There's not really anything that could cause a soft pedal in the rain only.

[King_Ch1cas]

Originally Posted by Halfkiddio

Rain will cause the pads to work slightly harder to do the same stopping force. I would suggest flushing the fluid and seeing how it feels after. There's not really anything that could cause a soft pedal in the rain only.

Yeah I can see how in the rain I have to press a little harder but this in this case the brake pedal is on the floor. If I pump the brake pedal it helps a lot if not I really have to go hard as if the cars off. Ima flush the brake fluid for sure this week, thank you

[Spooler]

Depending on what pads are on the car it could be due to them being cold. I have to tap my brakes from time to time driving on the interstate in the rain to keep my pads up to temp. I am running XP8's all around with Z1 2-piece rotors. It is not that bad at all unless they are stone cold.

[B&W_Evader]

Originally Posted by Spooler

Depending on what pads are on the car it could be due to them being cold. I have to tap my brakes from time to time driving on the interstate in the rain to keep my pads up to temp. I am running XP8's all around with Z1 2-piece rotors. It is not that bad at all unless they are stone cold.

Run XP8s all around here too. They've never felt like I had to push extra hard on them. Lowest temp I've seen on my instrument panel is 31 but car is garaged. Rain does not bother them either. Sounds like you need a bleed first. After that press your foot on the peddle, it should stay where it is with constant force. If is slowly moves down, you have a leak somewhere. It would probably be master cylinder or brake calipers. Check for gunk on the inside of the wheels to find the leaky caliper. Don't get brake fluid on your paint. Over time it will eat it up like paint remover.

[Spooler]

Originally Posted by B&W_Evader

Run XP8s all around here too. They've never felt like I had to push extra hard on them. Lowest temp I've seen on my instrument panel is 31 but car is garaged. Rain does not bother them either. Sounds like you need a bleed first. After that press your foot on the peddle, it should stay where it is with constant force. If is slowly moves down, you have a leak somewhere. It would probably be master cylinder or brake calipers. Check for gunk on the inside of the wheels to find the leaky caliper. Don't get brake fluid on your paint. Over time it will eat it up like paint remover.

The rain you have is nothing like we have. It's a downpour here. I drive in the rain all the time.

[King_Ch1cas]

Originally Posted by B&W_Evader

Run XP8s all around here too. They've never felt like I had to push extra hard on them. Lowest temp I've seen on my instrument panel is 31 but car is garaged. Rain does not bother them either. Sounds like you need a bleed first. After that press your foot on the peddle, it should stay where it is with constant force. If is slowly moves down, you have a leak somewhere. It would probably be master cylinder or brake calipers. Check for gunk on the inside of the wheels to find the leaky caliper. Don't get brake fluid on your paint. Over time it will eat it up like paint remover.

I'm going with these brake pads! Thanks man

[JARblue]

I'd be surprised if fresh fluid doesn't solve the issue for you.

[Halfkiddio]

I've had XP10/8's on the Z, and I now have Endless ME20's. I noticed a slight increase in pedal pressure when they were cold, but only to get actual bite out of them, not fluid travel. I do notice a slight hesitation when initially pressing the pedal, but only to clear water off the pad and rotor.


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[Spooler]

Originally Posted by Halfkiddio

I've had XP10/8's on the Z, and I now have Endless ME20's. I noticed a slight increase in pedal pressure when they were cold, but only to get actual bite out of them, not fluid travel. I do notice a slight hesitation when initially pressing the pedal, but only to clear water off the pad and rotor.


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This is what I was talking about. Guess some folks didn't understand what I was trying to say.

[BGTV8]

Originally Posted by Halfkiddio

I've had XP10/8's on the Z, and I now have Endless ME20's. I noticed a slight increase in pedal pressure when they were cold, but only to get actual bite out of them, not fluid travel. I do notice a slight hesitation when initially pressing the pedal, but only to clear water off the pad and rotor.


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ME20's on a DD Road Car ???

ME20 is a full race pad and it simply won't bite at low temps. You'll travel 20 metres plus just to get the pads up to temp so they bite, which puts you 20m closer to an accident every time. MX72

If you are using them as track-day pads (only), ignore my comments.

For OP, if the pedal is falling to the floor, then replacing brake fluid and bleeding the system is the very first step ... it is a basic maintenance and safety issue.

[Halfkiddio]

Originally Posted by BGTV8

ME20's on a DD Road Car ???

ME20 is a full race pad and it simply won't bite at low temps. You'll travel 20 metres plus just to get the pads up to temp so they bite, which puts you 20m closer to an accident every time. MX72

If you are using them as track-day pads (only), ignore my comments.

Yup. I have just under 20k miles on them. I have no issues with stopping on cold pads, besides a slight lack of initial bite as you mentioned. That being said, I have had more than a few panic stops with cold pads, and never once have I doubted them. The Carbotech's I had before them (XP10/8's) were worse.

However, I also live within an hour of the tail of the dragon, and have driven MX72's on a Z up there more than once. They do well, but not well enough for what we can achieve up there for braking temps. So I needed something more than what an MX72 can do. Hence the ME20 purchase. I may step down to an ME22 on the rear next time around though. It has a little too much rear bite for my driving style, although I can make it work very well in certain situations.

[KE_1508]

Give Torque RT700 a shot or Motul 660. If your foot is going to the floor, there might be a chance air is in the system. So a rebleed might cure the "foot to the floor" feeling. Also, have you checked the level in the reservoir?