How Are Brake Flanges Measured?
Updated 12/22/2025 | Published 10/01/2024
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Question:
How are trailer brake flanges measured - specifically this indicated 4 x 4inch flange? Distance between adjacent bolts or diagonally? Thanks! Evan
asked by: Evan
0
Expert Reply:
Both actually! They're measured center to center hole from left to right, top to bottom, and across diagonally like in the diagram below. The one in the picture below is the Brake Mounting Flange item # 4-35. What's also really important is the diameter of the center hole. This one's for a 2-3/8" round axle.
expert reply by:
Jerred H
0
Brake Flange Measurement
(click to enlarge)
(click to enlarge)
Product Page this Question was Asked From
Dexter Electric Trailer Brakes - Parking Brake Ready - 7" - Left/Right Hand Assemblies - 2.2K
- Trailer Brakes
- Electric Drum Brakes
- Standard Grade
- Manual Adjust
- 7 x 1-1/4 Inch Drum
- 2200 lbs Axle
- 10 Inch Wheel
- 12 Inch Wheel
- 13 Inch Wheel
- Dexter
more information >
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Jerred H.
12/22/2025
Hey Evan, did measuring the brake flange both ways help you confirm the right fit for your axle? Knowing how that 4 x 4-inch pattern lined up could really help others checking their trailer brakes. Your update could make it easier for the next person with the same question.