Enter on Facebook for Your Chance to Win with an Added Bonus
MCHENRY, Ill. – Feb. 8, 2019 – Looking to add a cool t-shirt to your collection? Raybestos® is giving away 50 limited edition Raybestos 1953 Chevy pickup t-shirts now through April 18, 2019, according to Kristin Grons, marketing manager, Brake Parts Inc.
Each week for 10 weeks, Raybestos will announce five randomly selected winners of a free XL
t-shirt featuring the iconic ’53 Raybestos Chevy on its Facebook page. To enter for a chance to win one of the t-shirts, visit www.facebook.com/RaybestosBrandBrakes and click on the t-shirt contest tab.
As an added bonus, all Raybestos t-shirt winners will be entered to win one offive commemorative tin tacker signs autographed by renowned builder Jeff Schwartz, owner of Schwartz Performance. Winners of these collectors’ items will be announced following the conclusion of the 10-week contest.
“Restoring and updating 1953 Raybestos Chevy pickup was such a hit with customers and auto enthusiasts throughout the country that we decided to run a fun contest to award limited edition
t-shirts and tin tacker signs to lucky followers of the build,” said Grons. “Don’t miss your chance to win a t-shirt that is sure to become a classic.”
Oftentimes, when a vehicle is brought into a shop with a complaint of pedal pulsation, a technician will diagnose the problem as a warped rotor. They will replace the rotors and send the vehicle on its way. If you follow this procedure, there is a good chance the vehicle will develop pedal pulsation problems again after a few thousand miles on the road.
In this video, we will discuss the myth surrounding warped rotors. We will show you what actually causes pedal pulsation, and how to fix the problem correctly the first time.
Let's dispell the myth right off the bat: rotors do not warp. To warp a rotor, you physically have to change its metallurgy. To change the metallurgy of the rotor, you need temperatures in excess of 2,300 degrees Fahrenheit. It's impossible for the brakes to get that hot in order to warp a rotor.
The true cause of pedal pulsation is disc thickness variation, which is the result of excessive lateral runout.
What is Disc Thickness Variation?
The cause of pedal pulsation is disc thickness variation. Disc thickness variation happens when a rotor varies in thickness on its surface.
What causes a thickness variation to occur? The answer is excessive lateral runout. Lateral runout is the amount of side to side movement of the rotor as it rotates.
Today's vehicles have extremely tight lateral runout specifications. Most vehicles have a specification of two-thousandths of an inch or less. If the runout is excessive, the rotor will begin to make contact with the brake pads as it wobbles back and forth. This contact between the rotor and brake pads won't be constant. It will happen periodically as the rotor wobbles back and forth.
If you use a semi-metallic pad, the pads will begin to grind away on the spots of the rotor that it contacts. This happens because a semi-metallic pad has an abrasive effect on rotors.
If you use a ceramic pad, the pads will leave a thin layer of friction material on the spots of the rotor that it contacts. This material transfer happens because ceramic pads have an adhesive effect on rotors.
Either way, this contact with the rotor is what causes a thickness variation. As the portion of the rotor with the thickness variation passes past the brake pads, the caliper piston has to extend or compress. This causes the pressure of the brake fluid to rise or fall during braking. This change of pressure is what leads to pedal pulsation.
What Causes Lateral Runout?
Lateral runout can be caused by uneven torque or a brake stud. However, the most common cause of lateral runout is rust buildup on the hub assembly. Hubs are often in use on a vehicle for hundreds of thousands of miles.
As you can imagine, a significant amount of rust will build up on that hub over that period of time. It is imperative that you take the time and clean the hub properly every time during a brake job. This will help ensure that you don't receive a comeback.
Steps to Checking Lateral Runout
1.) Clean the hub
2.) Install the rotor and conical washers
3.) Torque lug nuts down to specifications: Specifications can be found in a specification guide or the vehicle's service manual.
4.) Install dial indicator
5.) Check lateral runout by turning the rotor: Specifications can be found in a specification guide or the vehicle's service manual.
Correcting Lateral Runout
There are a few options you can choose from to correct lateral runout. The first option is to machine a rotor with a bench lathe or an on-the-care lathe. The other option is to replace the rotor with a new rotor.
No matter what option you choose, make sure that you re-measure the lateral runout and take the vehicle for a road test to ensure the pedal pulsation has stopped.
To stay up to date with the latest training videos from Raybestos, make sure to:
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