Hi, I’m Bob Holcomb from Apex Automotive in Great Barrington, Massachusetts. Today, we’re going to look at how to adjust a drum brake system. The first thing we’re going to do is remove the wheel, when you get to the last bolt be careful the wheel may fall off. Directly behind the wheel is the drum brake. In order to adjust this system we first have to know a little bit of how it works. Underneath the brake drum is a set of shoes, springs, clips and what not. The way the drum system works, this hydraulic cylinder puts pressure on these brake shoes. They push out of opposite of each other and put pressure on the drum. As they put pressure on the drum the drum can’t turn and that stops your wheel. To be adjusted properly these shoes should be slightly touching this brake drum while your car is running. Then when you apply your brake they’ll squeeze against the drum and stop your car. I can tell if they’re adjusted simply by how the drum comes off the car. These are a little bit loose as the drum can flop all around and there’s a little bit of space between the shoe and the drum. This particular drum system has something called a self adjuster. Every time I actuate the emergency brake it’s going to move a wheel that’s going to work against the thread that’s going to push these shoes out just slightly so when I pull the emergency brake the shoes are going to go wider and the adjuster’s going to go 1 click if there’s room. If there’s no room and the emergency brake hits the drum the brakes are adjusted. So if they’re out of adjustment you can sometimes actuate your emergency brake open, open and closed, open and closed and it’ll actuate the self adjuster. I’ve just adjusted these brakes out about 3 clicks. That should be enough to bring the shoes up against the drum. We can use a device to measure the distance between here and here and here and here and then subtract a couple thousandths of an inch or we can just fit them on and see what it feels like. When I put them all the way on I can hear the shoe touching the drum so that’s plenty tight enough and there’s not as much wiggle room as there was just a moment ago. If I had an access hole to turn the adjuster I would spin the wheel until I heard the shoes hit the drum and I started to feel some resistance and I’d back off a couple of clicks on the adjuster. Either way your rear drum brakes are now adjusted properly. I’m Bob Holcomb from Apex Automotive in Great Barrington, Massachusetts.

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