Question about bleeding the brakes
Thread Starter
Burning Brakes
Joined: Oct 2007
Posts: 792
Likes: 195
From: NC
Question about bleeding the brakes
I'm going to put in Motul RBF 600 this weekend in preparation for a track event next month and I'll be using my Motive pressure bleeder. I'm wondering if it's ok to force out all of the old fluid first. Meaning, pump air into the system to get all of the old fluid out before I put the new fluid in the system. My reasoning is that it will keep the different fluids from mixing and minimize the amount I'll be wasting for the bleed. Will I actually be wasting more fluid trying to get the air out if I do this? I'd like to know if this is a bad idea or just unnecessary. Thanks.
Melting Slicks
Joined: May 2004
Posts: 3,017
Likes: 2
I think its a bad idea. You might get air trapped in the ABS system and unable to get it out without exercising the ABS with a TECH II. I have a vacuum bleeder and suck the old fluid out of the MC, refill with fresh and begin the bleeding process. Works great on all my vehicles without issue..
Team Owner
Joined: Jul 2004
Posts: 24,652
Likes: 298
From: NJ
St. Jude Donor '05-'08
I would not do that. I would suck the old out of the master and put in new. I then would bleed making sure you don't run out. Just watch the fluid that is coming out and you should be able to tell when it is new then stop and move to new caliper.
You might waste some but nothing stupid.
You have read that you do not fill the motive with fluid correct?
You might waste some but nothing stupid.
You have read that you do not fill the motive with fluid correct?
Thread Starter
Burning Brakes
Joined: Oct 2007
Posts: 792
Likes: 195
From: NC
CF Senior Member
Joined: Feb 2006
Posts: 23,313
Likes: 25
From: Tucson Arizona
If I don't have someone handy to help press the pedal I use the Motive Bleeder just to pressurize the system (air only in the bleeder tank). Press the brake pedal a few times first to deplete the brake booster power reserve. I'd suck out the old fluid in the reservoir, fill with new fluid, pressurize with the Motive and then bleed the brakes in the proper order. Despite some differing opinions on the correct order the service manual still says to bleed RR, LF,RR, RF. Check fluid in the reservoir periodically so you don't run it dry and let air into the system. Remember to pump the brake pedal prior to driving away.
When convenient, I would still recommend you let the dealership completely flush the system (and refill with fresh Motul) as you can't exercise the ABS circuits without using a Tech 2 tool.
When convenient, I would still recommend you let the dealership completely flush the system (and refill with fresh Motul) as you can't exercise the ABS circuits without using a Tech 2 tool.
