Questions and Answers
ABS Brake Bleeding And ASE Study Guides
Q. Hello I like to ask Mr. Ciulla a Question about the right way of bleeding brakes for ABS autos I live in the state of Michigan and have a mechanics license, state not ASE.
Well not yet I'm licensed for unitized body repair, collision repair, mechanical and brakes with the state of Michigan and working on adding more like soon heating an A/C and as well ASE.
My question, Sir, is I heard two ways of doing a front disk brake service on autos, that when I do a brake job and install new pads that before I take off the caliper and remove old pad or even shoe in the rear drum that I as a tech should open the bleeders while pushing the piston back.
I should open bleeders on calipers while I push the piston back so that the contaminated brake fluid don't back up into the ABS system and do harm to the pressure valve and the mechanical ABS unit and that's its wise to crack open the bleeders so that contaminated brake fluid don't back up in the brake line and go to the ABS unit.
But I also heard that I don't need to do that but the mechanics that I talk to here say I should to prevent trouble coming back in the future with the ABS system. Now I been opening the bleeders and bleeding the systems before I do brake pad and shoe replacement and I was told too that some times its good to bleed the system to clean out all the contaminated fluid that it don't hurt to do that as well.
But I mainly like to know is that true about opening the bleeders before doing brake service and then closing them once the piston is back all the way and almost same with rear drum shoes and wheel cylinders.
And sir what you think of the ASE study guides I have the ones for all collision and paint and they are full of all info for a tech to use so I'm wondering if getting ASE mechanical guides will help me to get more state licenses on my mechanics license since I do have trouble at time with the writing tests and paper work well to me the ASE collision guides are full of info even though I know a lot of it but I see the guides cover a lot and are very interesting.
Thanks for any help,
A. Opening the bleeders on the calipers and wheel cylinders when you compress them is the right thing to do. You don't want to push back any debris that has accumulated in the system back into any of the ABS components or brake master cylinder.
The preferred method for bleeding ABS brakes is to use a vacuum bleeder. Bleeding order is from the master cylinder out. Then LF, RF, LR, RR.
Bleeding the system before doing anything is really not necessary, but it certainly won't hurt anything and can only make things better.
The ASE study guides are very helpful and well worth the price. You can never learn too much and in this business, learning is the only constant. I've been in this business almost 40 years and I still learn things almost on a daily basis.
Of course book learning is just the beginning. You need to apply what you've learned and gain practical experience in the real world. That's why, to get an ASE certification, you need at least five years experience before you can even take the certification tests.
I think if you stay on the path you're on, you will be an excellent mechanic.