GotQuestions? Wheel End Solutions

Q. With my parking brakes applied I can roll the truck forward. What's the problem?

Also, it doesn't move when I tried to reverse. The brake adjustment and brake system condition appear to be okay with 1.25 pushrod travel, 75% of the brake shoe is still there, and the drum are not damaged from heat glazing.

April 21, 2014

A. With 75% lining left on the shoes and the stroke at 1.25”, I question whether the drum is within spec or the s-cam bushings are worn out.

Author: Jeff Geist | Posted @ Monday, April 21, 2014 12:00 AM | » Comments(0)

Q. What environmental specifications and certifications does the TracBAT RF sensor have?

April 7, 2014

A. We do internal testing when making changes to the TracBat but I don’t have a MIL standard that we test to. These are the tests we run...

Author: Jeff Geist | Posted @ Monday, April 7, 2014 12:00 AM | » Comments(0)

Q. I need to know the cost factor between starting and stopping 19 times as apposed to starting and stopping 4 times in the same amount of miles.

I am doing a cost analysis on braking a semi - We haul 98,000lb on six axle tractor trailer rigs.

March 31, 2014

A. There is not enough information to calculate a precise dollar amount, however, you can make a reasonable estimate that your cost of operation performing (19) start/stop cycles VS. (4) would be (19 divided by 4) or 4+ times.

Author: Jeff Geist | Posted @ Monday, March 31, 2014 12:00 AM | » Comments(0)

Q. You released Aeris by STEMCO, your Automatic Tire Inflation System (ATIS) two years ago. What makes it different from an engineering and maintenance perspective?

March 17, 2014

A. At STEMCO, we’re wheel end experts, and over the years, we have observed a real problem with wheel ends getting pressurized, seals failing, and lubricants being discharged, due to faulty inflation systems releasing air into the hub. We designed Aeris on the principle of never, ever pressurizing the wheel end.

Author: Jeff Geist | Posted @ Monday, March 17, 2014 12:00 AM | » Comments(0)

Q. Does STEMCO make a metric valve stem that is common on Asian and Euro brand trucks?

This metric size refers to a smaller hole in the wheel to fit a smaller valve stem. In searching around the US market, I have been unable to find this dimension or able to gauge how common or standard this size is. Ken-Tool makes a slide hammer valve remover for Domestic wheels we're looking to adapt to fit these international wheels.

March 3, 2014

A. Yes, Europe uses a smaller size valve stem hole (10mm) with an o-ring seal vs a rubber bushing, same as used in typical North American aluminum wheels (not steel).

Author: Jeff Geist | Posted @ Monday, March 3, 2014 12:00 AM | » Comments(0)

Q. STEMCO Motor Wheel CentriFuse Brake Drums are well known for weight savings, but what other advantages can the user expect?

January 26, 2014

A: Independent laboratory testing has shown CentriFuse Drums to be the most durable and longest wearing drums available.

Author: Jeff Geist | Posted @ Sunday, January 26, 2014 12:00 AM | » Comments(0)

« Previous1Next »

Author Bio

Jeff Geist

Wheel End Expert

Ask a question

Sponsored by


We offer e-newsletters that deliver targeted news and information for the entire fleet industry.



The expert, Mark Betner from Citgo will answer your questions
Ask a question

Sponsored by


Wheel end expert Jeff Geist from STEMCO will answer your questions
Ask a question

Sponsored by