How to find the right Automotive Replacement Distributor Resistor Brushes AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Automotive Replacement Distributor Resistor Brushes
- Resistor vs non-resistor
- Replace with the same type the cap or vehicle specifies, resistor where the OE used resistor Resistor brushes suppress radio and electronic interference, and some ignition and ECU setups depend on that suppression.
- Resistance check
- Measure the brush with an ohmmeter and compare it to the service manual value Carbon resistors can drift open or high, which causes weak spark or misfire.
- Brush length and spring
- The brush must protrude fully and spring back freely against the rotor A short, sticky or cracked brush makes intermittent contact and causes arcing and rotor burn.
- Replaceable vs integral
- Confirm the brush in your cap is a separate serviceable part; otherwise replace the whole cap Many caps have the brush molded or retained in place and are not designed to be serviced.
Brands that matter
- Bosch: OE ignition supplier for many European cars, whose caps commonly use carbon brushes.
- Standard Motor Products: Wide coverage of caps and ignition small parts.
- Blue Streak: SMP's premium ignition line.
What to avoid
- Swapping a resistor brush for a solid or non-resistor one on a car that specifies resistor suppression
- Reusing a cap with carbon tracking just because the brush is new
- Brushes with no stated fitment or resistance specification
Questions
Should I replace the brush or the whole cap?
If the cap shows cracks, carbon tracks or eroded terminals, replace the cap, which normally includes a new brush. Replace only the brush when the cap is otherwise sound and the brush is a serviceable part.