getting the basics right…
I’ve been around old Volkswagens and dune buggies long enough to tell you, once everything’s bolted up is when most folks get themselves into trouble. I always take a minute and look things over.
You’ve got the calipers mounted and centered on the discs, lines run, and a new master cylinder and reservoir in place, that’s all fine. But none of it means much if the basics aren’t right – now its time to bleed the brakes.
First thing I check is the brake pedal free play. There needs to be about an eighth to a quarter inch between the push rod and the master cylinder plunger. I don’t guess at it, I make sure. If that plunger can’t come all the way back, the master cylinder won’t refill properly from the reservoir. I’ve seen perfectly good brake systems act faulty just because that adjustment was off.
Then I look at the calipers. The pads should already be sitting against the discs on both sides, and the pistons should be up against the pads. If they’re not, you’re wasting time trying to bleed air out of a system that isn’t even positioned correctly yet. If I need to move the pistons in, I’ll usually disconnect the hose at the caliper and use a little shop air to bring them in. Quick and effective.
Once I know everything is where it should be, I fill the reservoir — but only with fresh brake fluid from a sealed container. Brake fluid doesn’t tolerate being left open. It pulls moisture out of the air, and moisture is what ruins brake systems from the inside out. I don’t take chances there.
Before I get into any pressure bleeding, I like to let gravity do some of the work. If the setup allows it, I’ll open all four bleeders and let fluid start working its way through the system on its own. Catch cans under each wheel, of course. Once I see fluid at each corner, I close them up. That step alone saves time and makes the rest of the job smoother.
From there, I bleed the system. I’ve used every method over the years —manual two-person bleeding, vacuum pumps, pressure systems, even reverse bleeding setups. They all work if they’re used properly. The method matters less than the consistency.
What does matter is the order. I always start with the wheel furthest from the master cylinder—right rear, then left rear, right front, and finally left front. That’s not a suggestion, that’s just how it’s done if you want all the air out.
If I’m doing it manually, I make sure the pedal is worked slowly and allowed to return fully every time. When pressure builds, I open the bleeder, let the pedal drop, then close it before the pedal comes back up. No shortcuts. Rushing that step just puts air right back into the system.
When I get a firm pedal, I don’t assume I’m done. I top off the reservoir, then take the car out and use the brakes enough to seat the pads. After that, it comes back into the shop for another look. I check fluid level again, and I look carefully for any signs of seepage. Even a small leak will show itself at this stage.
Most of the time, I’ll do a quick final bleed at each wheel just to confirm there’s no air left — just clean fluid.
Bleeding brakes isn’t complicated, but it does require patience and attention to detail. I’ve always treated it as one of those jobs where you either do it right the first time, or you end up doing it twice. When it’s done properly, you’ll feel it immediately — a solid pedal, consistent response, and a car that stops exactly when it should. That’s the standard I’ve always worked to.
Alright now, the brakes are bled, the pedal feels good and firm, and you’ve checked over everything with no leaks showing up. You’re close—but don’t hang the tools up just yet. There’s one more step, and it’s an important one: bedding the brakes.
Old timers like me call it “burnishing.” Same thing. What you’re doing is using a little heat and rotor rotation to transfer a thin layer of brake pad material onto the rotor surface. That helps the pads and rotors get acquainted proper-like. It improves braking performance, helps the pads last longer, and keeps those embarrassing squeals and screeches to a minimum.
It’s simple enough, but it takes a little patience.
The best method is what we call the 30/30/30 method:
- 30 slow-downs
- From 30 mph down to about 10 mph
- With about 30 seconds of easy driving between each one so the pads can cool
Notice I said slow-downs, not full stops. Don’t come to a complete stop. You want that rotor still turning so the pad material lays down nice and even. Sitting still with hot pads pressed against the rotor can leave uneven spots, and that’ll cause chatter later.
There’s also the quicker method, the 10/65/30 method:
- 10 slow-downs
- From 65 mph down to 10 mph
- With 30 seconds of cool-down driving between each one
It works fine and gets the job done faster, but finding a safe place to do that can be a challenge. Around here, slowing from 65 to 10 on the wrong road might get you introduced to the front bumper of a dump truck—and trust me, that’s not part of the brake procedure.
A lot of folks skip this step because the brakes feel “good enough” after a quick driveway test. Don’t be that guy.
Take the extra time. Bed them in right.
That way, you won’t be the fellow at the cruise-in with the nice buggy and the screechy brakes everyone hears before they see you.
– John Mickle
