THSCC Forums

Maybe you can help me. No matter how I open the bleeder screw, I the fluid will not flow in a constant manner. It seems more like a spit than a stream. I'm pumping about 25 in/hg of vac and slowly opening the screw. Its pulling very little fluid. Nothing like the steady stream when someone is there to pump.

Motive Power Bleeder

/end thread

Seriously - I tried the MityVac exactly once, now I just use it to suck out the reservior before attaching the power bleeder.

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One of those LeMonHeads...
91/95 Miata, 02 Focus SVT, 01 Ford F250, 09 Suzuki SV650SF
rusty 84 C4 Vette, tiny piece of the General Lei
Irish Sport Horse - 1hp NA!

You know I borrowed and tried one on our Jetta and it did not move the fluid well at all so I sort of gave up on it. Maybe though it would work better with the RX-8.

Yes. Kendt speaks the truth.

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Karl S.
2014 Baby, 2014 House, 2013 Ford Focus ST, 2013 BMW 328i, 1994 Mercedes E320
(Insert passive aggressive signature line here)

My MitiVac showed an amazing ability to suck air in around the bleed screw threads. No, applying grease to the threads did not help.

Bought a Motive Products power bleeder. It did not push fluid through nearly as fast as someone pumping the pedal (in fact, just a trickle at the rear brakes), but it did eventually clear the residual air out of the MC and the lines. 4 quarts of fluid and a 1/2 day of vacation... Only problem was when the adapter popped off the master cylinder and sprayed brake fluid around the engine compartment. I never knew I could mount 4 wheels and get the car off jack stands that fast. (Had to get it outside to wash out the brake fluid)

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Art McDonald
Premier Amateur #518
2008 Dishman Cup
Pivot Cone Snob

Rodney is a waxer (but in a good way)

That actually gets easier with practice Art. And here's another tip - test fit the adapter with an empty power bleeder before filling it with fluid. If you can hear air hissing out of it, you need to check your fittings.

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Karl S.
2014 Baby, 2014 House, 2013 Ford Focus ST, 2013 BMW 328i, 1994 Mercedes E320
(Insert passive aggressive signature line here)

I've never needed to move 4qts of brake fluid through a car before to get it bled properly. I could see putting fluid in the Motive unit. For my bleeding purposes. I don't even put fluid in the Motive. If needed remove fluid from reservoir with big syringe. Fill to top. Attach Motive and pump to 15lbs. Start bleeding. After about 4ozs or so. Let pressure out of bleeder, remove from reservoir, add fluid. Pump up Motive again and finish.

I never have to deal with fluid in the Motive unit or making a big mess. It's just there for applying pressure. I get very good flow out of the bleeders with it.

The Mighty Vac I had the same problem with. Makes lots of air bubbles around the bleeder screw. Not much else...

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http://www.greywinds.com

Ditto on Graham's method. I have done it both ways. While it might take a little longer than putting a bottle of fluid in the bleeder, it drastically reduces the chances for a big mess!

The mighty vac is like chasing your tail, go around and around and seldom have a good result.

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2002 MCS, 2003 MCS Track Rat, 2003 Generic White Yukon, 2003 BMWk1200rs, 1973 CB350F, 02 996. 08 Cayenne Turbo
http://www.clinehallagency.com

I have gone back to the old pumping the pedal method. I have both the motive and the mighty vac.

The motive on the rectangular GM reservoir just will not seal properly for me. The mighty vac is a hit or miss. Currently, it works great on the right side caliper but will not seal on the left side. It is a temperamental POS.

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Jim Pastorius
2008 Silverado VortecMax
1992 Camaro CMC#92
2002 BMW R1150R

2009 3rd Place CMC Mid-Atlantic Championship
2009 CMC Hyperfest Winner

I use the "dry power bleeder" method that Graham describes. I use a home-built bleeder (thanks VK) with a Motive cap, and it works great. I will deal with the annoyance of having to disconnect the cap and refill the reservoir over spilling brake fluid everywhere.

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Tom Freeman
'98 M3/4/5 | '93 Spec3 325i | '12 TSX sport wagon | '03 Tahoe
Team Silver Bullets '91 240SX

I don't mind giving up on the Mity Vac since I got in for vacuum and pressure solenoid testing anyway. I had used Speedbleeders on my RX-7 with great luck, but I've heard some scary stories since and I'm less enthusiastic about using them on the RX-8.

What scary stories?

Thanks

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Dick Rasmussen

FS 50 2018 Mustang GT

Various tales of leakage and failure on the internets. FWIW. I never had any issues. I loved them, but I'm very much about not introducing more possible failure points.

I may pick up a used Motive bleeder. If anyone here has one they want to sell with a cap that will work on the RX-8....lemeno.

I had one break when I was bleeding the driver's front in the Miata. I shipped the caliper back to Speedbleeder, they got the old one out and replaced with a new one. :shrug:

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Has no responsibility whatsoever.