Brakes Sticking - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Oaktown 986 · 08-24-2009, 07:34 AM

Hey,

My MY99 is having an unusual "problem". Sometimes, usually when the car is just starting up as well as when I've been driving in stop and go for a while, the brakes stick. The pedal goes down, I brake, then upon release of my foot off the brake pedal, it does not fully return to its original position. There is still braking pressure being applied, as I live in a hilly region, and I can rest at an incline in place without rolling backwards.

I've never had this problem before, but the brakes are in great condition, have plenty of power, are not scored, and the brake fluid level is at a perfect point. I'm doing some maintenance next week (spark plugs, oil change, air filter) and would like to fix whatever it is ailing me at the same time. Any suggestions?

jon

eightsandaces · 08-24-2009, 08:30 AM

Have you checked the brake/clutch fluid level? I'd bleed the entire system, might as well change the fluid when you do, I'd bleed the clutch too. If that has no effect it could be in the master CYL, hope this helps...

Oaktown 986 · 08-24-2009, 08:44 AM

I hate to sound inexperienced since I've done some semi-advanced work on autos before, but I've always outsourced brake work to one of my buddies. We now live nowhere near each other... so I have to learn.

Can you explain how I'd go about doing that? Or a link to help?

Thanks!

Lil bastard · 08-24-2009, 12:12 PM

Sounds like the MC to me.

eightsandaces · 08-24-2009, 12:13 PM

The easiest way I have ever done it is with a power bleeder, which is a pressurizing device that you screw onto the fluid reservoir. Once attached you pump up to manufacturer spec pressure then open the bleeder screws on the caliper one at a time and run the fluid out till you see no air bubbles. (should only be a very short period of time). Then repeat the same with all four calipers and for good measure with the clutch bleeder under the car on the drivers side, see bentley for a good pic.

PS If you don't have a power bleeder have an assistant pump up the brakes and maintain pressure on the pedal when you open the bleed screws. Do each wheel, two bleeders per wheel one at a time, if that doesn't fix it then I'm with lil B prolly a master cylinder.

Oaktown 986 · 04-29-2010, 06:23 AM

Quote:

Originally Posted by eightsandaces

The easiest way I have ever done it is with a power bleeder, which is a pressurizing device that you screw onto the fluid reservoir. Once attached you pump up to manufacturer spec pressure then open the bleeder screws on the caliper one at a time and run the fluid out till you see no air bubbles. (should only be a very short period of time). Then repeat the same with all four calipers and for good measure with the clutch bleeder under the car on the drivers side, see bentley for a good pic.

PS If you don't have a power bleeder have an assistant pump up the brakes and maintain pressure on the pedal when you open the bleed screws. Do each wheel, two bleeders per wheel one at a time, if that doesn't fix it then I'm with lil B prolly a master cylinder.

So I bled the brakes, and the problem disappeared for about 10 minutes. It then returned; I jacked the front end up, and checked the wheels while a buddy braked. It looks like the passenger side front is spraying a small amount of brake fluid out when braking from behind the caliper at the attachment point of the brake line and the caliper.

Thoughts?

Jon

extanker · 04-29-2010, 06:37 AM

it looks like you have been working on this car for 8 mos. perhaps a flatbed to a repair shop would speed the process along.

Oaktown 986 · 04-29-2010, 06:47 AM

Quote:

Originally Posted by extanker

it looks like you have been working on this car for 8 mos. perhaps a flatbed to a repair shop would speed the process along.

Well, it's not a huge problem. I have 3 cars, but I drive the Porsche 2-4x per week. I've put 30k on it in the past year, and the little irksome things are starting to pile up...