Tech Feature: Brake Job on Chrysler Sebring
The Sebring was replaced with a new model based on the JS platform for the 2007 model year. There are several brake packages available featuring either a disc/drum combination or a disc/disc combination. All models are equipped with five possible brake system options.
TPMS UPDATE: BMW Systems
BMW has offered Tire Pressure Monitoring Systems (TPMS) on most of its vehicles since 2002. Some 2002 and 2003 models have a indirect system called Flat Tire Monitor (FTM). These system compare the inputs of the wheel speed sensors to detect a flat tire. These early indirect and direct systems were implemented not to meet the 2007 government mandate, but to inform the driver when a run-flat tire was deflated.
Brake Pad Bedding – Adding a Little Seasoning to the Rotor
One of the most controversial topics involving brake repair is where noise comes from and what can be done to prevent it. All brake noise starts at the point where the pad and rotor make contact. Every squeak, chirp and groan has its origins at the interface between these two components and how it is expressed through the rest of the car.
BRAKE LIGHTS: March 1951
BRAKE & FRONT END, March 1951– Before dynomometers, load cells and computers, engineers used brake pedal applicators to determine the stopping distance of new cars and the effectiveness of brake systems and linings. Bravery was a job requirement.
Alignment & Suspension Specs: 2004-2007 Chevrolet Malibu
In 2004, the Malibu was redesigned and moved to the new Epsilon platform. This generation of the Malibu lasted until 2007 and included the Malibu Maxx. But, the Malibu sedan remained in production for fleet orders until the 2008 model year. GM refers to these models as the Malibu Classic.
TPMS Q&A: Common Questions and Answers about Tire Pressure Monitoring Systems
What is one of the leading causes of sensor failure? Corrosion, sensors or sensor stems can be damaged by corrosion from road salts, moisture, missing valve caps or galvanic corrosion. The use of dissimilar metals or use of non-TPMS components can result in galvanic corrosion, which may affect the sensor’s ability to read or transmit data.
RETRO: Brakes Save Tires For World War II
During WWII, the US was cut off from its rubber plantations in Malaysia, Singapore and Brunei. With rubber needed for war effort, tires on the home front were rationed. With the drum brakes of the day(hydraulic and mechanical), brakes lock up was common due to brakes that were out of adjustment.
OE vs. Aftermarket Brake Pads: Smoke, Mirrors and Friction
I was recently doing a brake job on my 2002 Jaguar X-Type. On one of the rear caliper bolts there was a 12-oz rubber and steel donut. The reason for the weight is to help dampen vibrations and shift the frequency.
ALIGNMENT & SUSPENSION SPECS: 2002-2010 Jeep Liberty
The Liberty (2002-2007 KJ+2008-2010 KK) was the replacement for the Cherokee (XJ). The major changes from the Cherokee to the Liberty were an independent front suspension and trailing arm rear suspension. Compared to the Cherokee, the Liberty is actually easier to align.
BRAKE MATH: CALCULATING THE FORCE NEEDED TO STOP A CAR
Harold Unikel of Power Brake X-Change, of Pittsburgh, PA reminded my why it is so important for technicians to be able to understand the brake math basics. I made a mistake while editing the equation for calculating the surface area of a circle which is πR2.
BRAKE MATH: PSI & Clamping Forces What happens in the real world?
In our last installment of Brake Math, we demonstrated how 70 lbs. of force on a brake pedal can result in 556 psi of brake fluid heading to the calipers. So how does this pressure stop a car? Next, we we look at how PSI is turned into “clamping force” and the math behind it. Also, we will look at the implications it has on friction materials and caliper design.
Tech Feature: Brake Job on Ford Edge
The Ford Edge is an SUV based on a the CD3 platform. The brakes on these vehicles are straightforward and do not break any new ground. The brake systems on all variants have disc brakes at all corners. There are no major changes to the brakes system from 2007 to 2009. For the 2008 model year, ABS became a standard feature, as did a direct tire pressure monitoring system. The worst brake component to service is the master cylinder. Getting to the unit requires removal of the trunking for the air intake, battery tray and other components.