BENDIX BW7532 User Manual
Bendix Commercial Vehicle Systems LLC • 901 Cleveland Street • Elyria, OH 44035 • www.bendix.com • 1-800-AIR-BRAKE
BW7532 ©2013 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • All Rights Reserved
BW7532 ©2013 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • All Rights Reserved
3
The key to limiting center seal damage and to reduce the effects of friction is to ensure a straight motion of the
pushrod. This may be accomplished by properly aligning the moving components and by providing the right bearing
surface for the pushrod to travel through. Unfortunately, low-quality spring brake designs typically do not account
for this design feature and fail to properly maintain centering of the spring and pushrod, increasing the likelihood of
center seal issues.
In contrast, OEM spring brakes properly address the impact of side loads to minimize the potential for center seal
damage and reduce friction losses. For example, the Bendix
pushrod. This may be accomplished by properly aligning the moving components and by providing the right bearing
surface for the pushrod to travel through. Unfortunately, low-quality spring brake designs typically do not account
for this design feature and fail to properly maintain centering of the spring and pushrod, increasing the likelihood of
center seal issues.
In contrast, OEM spring brakes properly address the impact of side loads to minimize the potential for center seal
damage and reduce friction losses. For example, the Bendix
®
EverSure
®
spring brake features a patent-pending
slotted center seal design that clips into the adapter base and is held firmly in place to serve as a bearing for the
pushrod. This design – along with other built-in measures such as a high-profile, flat, aluminum pressure plate –
helps to center the power spring and ensures more consistent and reliable force output.
Addressing the Chamber Housing
pushrod. This design – along with other built-in measures such as a high-profile, flat, aluminum pressure plate –
helps to center the power spring and ensures more consistent and reliable force output.
Addressing the Chamber Housing
An additional consideration for spring brake operation is the non-pressure housing, which is located near a brake’s
chamber mounting bracket. All spring brakes are mounted at this location. Because most of the weight of the
overall spring brake is between 6 to 9 inches away from the mounting surface, there is significant force on the non-
pressure housing as a vehicle vibrates during operation.
In lower-cost/low-quality spring brake designs, the non-pressure housing may not be optimized to handle the load
put on it by vibration and the weight of the part itself. In this case, the spring brake itself can actually rip free from
the vehicle, causing a very concerning failure on the road that places other motorists at risk. In contrast, an OEM
quality spring brake, such as the Bendix EverSure maintains the integrity of the mounting surface and reduces the
stress put on this area through a weight savings of 2 – 3 lbs. when compared to most other T30/30 spring brakes.
Calculating Real Savings
chamber mounting bracket. All spring brakes are mounted at this location. Because most of the weight of the
overall spring brake is between 6 to 9 inches away from the mounting surface, there is significant force on the non-
pressure housing as a vehicle vibrates during operation.
In lower-cost/low-quality spring brake designs, the non-pressure housing may not be optimized to handle the load
put on it by vibration and the weight of the part itself. In this case, the spring brake itself can actually rip free from
the vehicle, causing a very concerning failure on the road that places other motorists at risk. In contrast, an OEM
quality spring brake, such as the Bendix EverSure maintains the integrity of the mounting surface and reduces the
stress put on this area through a weight savings of 2 – 3 lbs. when compared to most other T30/30 spring brakes.
Calculating Real Savings
In general, a low-quality spring brake may cost $10 to $15 less than an OEM spring brake. These savings look
attractive on the front end, but they can quickly fade away in the long run as low-
quality brakes will need to be replaced more frequently than OEM brakes. That means
added costs for replacement parts, as well as expense associated with the fleet’s
hourly labor and downtime rates.
OEM spring brakes present a substantial savings of time and money that really add up
when you evaluate spring brake purchases for the total fleet over the span of several
years. So while you may pay less for a low-quality spring brake up front, you’ll pay
more – and more frequently – down the road.
Ensuring Vehicles Stay Parked
quality brakes will need to be replaced more frequently than OEM brakes. That means
added costs for replacement parts, as well as expense associated with the fleet’s
hourly labor and downtime rates.
OEM spring brakes present a substantial savings of time and money that really add up
when you evaluate spring brake purchases for the total fleet over the span of several
years. So while you may pay less for a low-quality spring brake up front, you’ll pay
more – and more frequently – down the road.
Ensuring Vehicles Stay Parked
To avoid the pitfalls associated with low-cost/low-quality aftermarket spring brakes,
when selecting replacement spring brakes, fleets should look to qualified OEM brake
suppliers for product durability, extended service life, and after-sales support. OEM
replacement spring brakes are designed to protect springs from premature failure,
ensure sufficient parking force output over time, shield interior components from wear
and leakage, and minimize the impact of side load stresses. And despite their initial
cost premium, OEM replacement brakes can save fleets money over time, while
when selecting replacement spring brakes, fleets should look to qualified OEM brake
suppliers for product durability, extended service life, and after-sales support. OEM
replacement spring brakes are designed to protect springs from premature failure,
ensure sufficient parking force output over time, shield interior components from wear
and leakage, and minimize the impact of side load stresses. And despite their initial
cost premium, OEM replacement brakes can save fleets money over time, while
delivering the peace of mind that comes from using a high quality product specified by OEMs.
For more information, contact:
Barbara Gould
For more information, contact:
Barbara Gould
or
Ken Kesegich
Bendix Commercial Vehicle Systems LLC
Marcus Thomas LLC
(440) 329-9609 / (440) 225-6869
(888) 482-4455
barbara.gould@bendix.com
kkesegich@marcusthomasllc.com
OEM replacement
spring brakes are
designed to protect
springs from premature
failure, ensure sufficient
parking force output
over time, shield interior
components from wear
and leakage, and
minimize the impact of
side load stresses. And
despite their initial cost
premium, OEM
replacement brakes can
save fleets money over
time.
spring brakes are
designed to protect
springs from premature
failure, ensure sufficient
parking force output
over time, shield interior
components from wear
and leakage, and
minimize the impact of
side load stresses. And
despite their initial cost
premium, OEM
replacement brakes can
save fleets money over
time.