Brake fluid change
Thread Starter
Burning Brakes
Joined: Jun 2016
Posts: 761
Likes: 66
From: Fitzwilliam New Hampshire
Brake fluid change
1994 c4 base What is best procedure to change /flush brake fluid without createing abs problems?I beleive fluid is original.Thanks in advance for help here.Last fluid to change,all others done but brakes.
Last edited by A Peter C4; Sep 9, 2016 at 12:08 AM.
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
Just keep the master filled while bleeding. If you get any air in it you will be sorry. I would suck out the master with a turkey baster first to get as much crap out as you can.
Last edited by antfarmer2; Sep 9, 2016 at 09:07 AM.
Racer
Joined: May 2013
Posts: 405
Likes: 15
From: Panama City Beach Florida
Small shop vac
The small 1-2 gallon shop vacs use a smaller diameter hose and are the exact size to fit the master cylinder diameter. Cleans it out good!
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
I use a Motive Products tool. It pushes fresh fluid into the reservoir. Unless you really run the main tank dry, there is little chance of a air bubble in the lines. Seeing as I have 5 vehicles and do this every other year, the tool is an investment. Most people like to believe it is a lifetime issue and fill it every so often. MB recommends the flush every 2 years which is why I bought the tool. To do it on all my vehicles.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
These guys gave several good techniques. I'll add this: before starting, compress all the caliper pistons fully. This will push most contaminated brake fluid from the caliper, allowing you to extract that too, during bleeding. Otherwise, it can sit in the caliper relatively undiluted by the new fluid.
Anyway, when you're done, pump the pedal and that will push your pistons back out to the rotor, simultaneously filling the caliper bores w/new, fresh fluid.
Anyway, when you're done, pump the pedal and that will push your pistons back out to the rotor, simultaneously filling the caliper bores w/new, fresh fluid.
Last edited by Tom400CFI; Sep 9, 2016 at 02:58 PM.
Melting Slicks
Joined: May 2013
Posts: 2,692
Likes: 349
From: Sacramento California
I'd suggest stirring up the contents of the master cylinder (probably sediment at the bottom) and suck that out, then refill and stir/suck again... when the master is fully clean, then proceed with the bleeding however you prefer to do it.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Earls makes a bleeder with check ball and spring for one person brake bleeding.
Simply crack open this bleeder and press the brake pedal or mini-vac to draw fluid from the res.
I run this procedure once a year. And replace the res fluid at each oil change.
Simply crack open this bleeder and press the brake pedal or mini-vac to draw fluid from the res.
I run this procedure once a year. And replace the res fluid at each oil change.
Drifting
Joined: Mar 2012
Posts: 1,492
Likes: 61
From: New Jersey
I have used a homemade pressure bleeder on other vehicles but when I got the C4, I treated myself to a set of Speedbleeders -
http://www.speedbleeder.com/
They work very well and are easy to use.
http://www.speedbleeder.com/
They work very well and are easy to use.
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Oil Producer
Joined: Apr 2014
Posts: 9,372
Likes: 2,736
Ak, is this the unit that pushes the fluid from the callipers up into the res? That always made. sense to me as it would be easier for air to go up than down. if this is it, do you like it?
I use a Motive Products tool. It pushes fresh fluid into the reservoir. Unless you really run the main tank dry, there is little chance of a air bubble in the lines. Seeing as I have 5 vehicles and do this every other year, the tool is an investment. Most people like to believe it is a lifetime issue and fill it every so often. MB recommends the flush every 2 years which is why I bought the tool. To do it on all my vehicles.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
You suck the fluid out of the reservoir, fill with fresh fluid, strap this thing onto the reservoir and pump the air pump. That pressurizes fluid from the tank into the reservoir and the bubbles in the reservoir go up to the tank. Fresh fluid pressurizes the line. You open the bleeder and as long as there is air pressure in the tank, fluid will be pushed out into the reservoir and into the calipers. When you are done, close off the bleeder and move on to the next.