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914World.com _ 914World Garage _ bleeding dual port brake calipers

Posted by: Elliot Cannon Jul 17 2003, 02:29 PM

Hi,
This might have been answered earlier but I can't find it. When bleeding calipers with dual ports, do you bleed the bottom one first or the top one? I'm guessing the bottom one first but not sure.
Cheers, Elliot

Posted by: Qarl Jul 17 2003, 02:38 PM

You're correct.

Also rap on the proportioning valve and caliper with a wrench or something to release any trapped bubbles.

Another trick is to jack up each corner of the car that is being bled. Thought being that any trapped air will rise to that corner and come out.

And have lots of extra fluid and bleed like crazy.

Keep an eye on your fluid level, that it doesn't get low, so you don't introduce exta air into the system.

Also... invest in speed bleeders if you don't have a helper.

Hope that helps!

Posted by: serge914 Jul 17 2003, 02:38 PM

Air bubbles always try to go up so I only bother to bleed the top ones.

Maybe someone can tell me if I am right.

Posted by: Brad Roberts Jul 17 2003, 06:11 PM

No need to bleed the bottoms.. waste of time and effort. Its easier to manufacture the caliper for multiple cars and have multiple bleeders.

B

Posted by: Mike's2nd914 Jul 17 2003, 08:42 PM

Bleed the top only. Haynes indicates the bottom are to be used only to drain the system. Haynes also gives the following order in which to bleed: RR, LR, RF, LF. Bleed until you think you have it, then bleed some more!

Posted by: seanery Jul 17 2003, 08:53 PM

start the farthest away from the MC and work towards it is the theory behind the order.

Posted by: Lawrence914-6 Jul 18 2003, 06:28 AM

If you're bleeding, then use the top.

If you're doing a flush, you could use the bottom screw first, to get fluid out of the bottom of the chamber in the caliper.

-Rusty