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- Freightliner FLD SBA Brake Chambers & Acc.
Freightliner FLD SBA Brake Chambers & Acc.
Frequently Asked Questions About Freightliner FLD SBA Brake Chambers & Acc.
What size brake chambers are compatible with my Freightliner FLD model year?
Most Freightliner FLD models from 1989-2007 use Type 30/30 brake chambers for the front axle and Type 30 or 36 for the rear, depending on your GVWR. FLD112 and FLD120 models typically require Type 30/30 front chambers, while heavier FLD132 models may use Type 36 rear chambers. Always verify your specific requirements by checking the data plate on your existing brake chambers or consulting your vehicle's specification sheet.
How difficult is it to replace brake chambers on an FLD, and what tools do I need?
Brake chamber replacement is a moderate-difficulty job that takes 1-2 hours per chamber for experienced mechanics. You'll need a 3/4" and 7/8" wrench for the air lines, a 9/16" wrench for the clevis pin, and a caging bolt tool. The most challenging part is often accessing the rear chambers due to limited clearance. Make sure to cage the spring brake before removal and always replace chambers in axle pairs to maintain balanced braking.
What's the difference between standard and long-stroke brake chambers for my FLD?
Long-stroke chambers provide 3" of pushrod travel compared to 2.5" for standard chambers, offering better brake adjustment range and reduced maintenance frequency. While both fit the same mounting brackets on FLD models, long-stroke chambers are recommended for severe-duty applications or if you're experiencing frequent adjustment issues. They typically cost 15-20% more but can extend service intervals by up to 50%.
Are aftermarket brake chambers reliable, or should I stick with OEM Bendix or Haldex?
Quality aftermarket chambers from manufacturers like MGM, Gunite, and Sealco perform comparably to OEM units and often cost 30-40% less. Look for chambers that meet FMVSS-121 standards and feature welded construction rather than crimped. Avoid extremely cheap imported chambers as they may have inconsistent spring rates or premature diaphragm failure. Many fleet operators successfully use aftermarket chambers with proper 90-day inspection intervals.
Why are my new brake chambers not releasing properly after installation?
Poor release is usually caused by contaminated air lines, incorrect pushrod adjustment, or binding in the slack adjuster. First, ensure you've purged all air lines of moisture and debris before connecting new chambers. Set initial pushrod length to match your old chambers (typically 5.5" to 6.5" for FLD applications). If problems persist, check for frozen slack adjusters or S-cam bushings, which often fail around the same time as chambers and can prevent proper release.