JCB Brake Seal & Wheel Cylinder Issues
Applies to: JCB 3DX / 4DX
Warning signs
- Pedal spongy or low
- Oil at brake drums
- Pulling on application
- Air after bleed attempts
Common causes
- Seal hardening
- Cylinder bore scoring
- Contaminated brake fluid
- Improper bleed sequence
Parts to quote
Typical line items workshops order alongside this fault (use as keywords on your RFQ):
FAQ
Do you supply full axle brake kits?▼
Yes — list axle side, serial range, and drum type on your RFQ for a matched kit quote.
Need parts for this issue?
We stock OEM-compatible lines for JCB-class machines — bulk and export.