332/G1020
  • Brand
    JCB
  • Article
    332/G1020
  • Machine system
    Brake system
  • Part type
    Brake valve
  • Machine brand
    JCB
  • Manufacturing type
    Original
  • Compatibility
    JCB 3CX, 3DX
  • All the features
In stock
0,00 ₺
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Brake valve 332/G1020 is a genuine JCB part for the JCB 3CX and 4CX backhoe loaders.

The brake valve (brake master valve) sends pressurised oil into the brake circuit when the pedal is pressed and applies the brakes. In the JCB catalogue 332/G1020 is a brake valve, and sources list it for JCB 3CX and 3DX backhoe loaders. A worn brake valve makes the pedal travel longer, weakens the brakes or stops them releasing fully, which directly affects safety. Replace the brake valve only with a valve of the same number. After the change, bleed the brake circuit according to the service instructions and test the brakes in a safe area. The genuine JCB valve comes with the dimensions and settings JCB specifies. The part is chosen by part number and compared with the old one before fitting.

Specifications


Part number332/G1020
ManufacturerJCB
Production typeOriginal
Part typeBrake valve
System / groupBrake system
Machine makeJCB

Compatibility

Other parts are in Hydraulic valves.

Fitting

Before fitting, compare the part number and any setting mark on the body with the old valve. Leave the adjusting screw of preset valves alone; settings are checked only with a gauge against the service data. After fitting, check the hydraulic oil level, and if the valve failed because of dirty oil, change the hydraulic filter as well.

Specifications

  • Machine system
    Brake system
  • Part type
    Brake valve
  • Machine brand
    JCB
  • Manufacturing type
    Original
  • Compatibility
    JCB 3CX, 3DX
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JCB 3CX / 4CX 07/10/2026 54
JCB 3CX and 4CX hydraulic circuit diagrams by build year, with component keys
There is no single hydraulic circuit for the JCB 3CX and 4CX backhoe loader: it depends on the build year and the pump type. Section E of the JCB service manual (publication 9803/3290-14) gives separate circuits for the gear pump 3CX built before and after September 2007, for the variable flow 4CX (7-spool and 6-spool), and for the 3C-14 (214e) and 3C machines. Below you will find the circuits themselves, the component keys and some notes on tracing the oil flow through a circuit.
Useful articles 07/10/2026 41
JCB 3CX / 4CX Hydraulic Pressure: Settings, Pressure Testing and Causes of Low Pressure
On JCB 3CX and 4CX backhoe loaders with a gear pump, the working pressure of the hydraulic system is limited by the main relief valve in the loader valve: 236–241 bar on machines up to serial number 964124 and 248–252 bar on machines from serial number 964125 (standard and high-pressure hydraulics). It is checked with a 0–400 bar pressure gauge connected to the loader valve test point, with the engine at 1500 rev/min and the oil warmed to 50 °C. Below are the settings, the test procedure and the reasons why pressure drops, taken from the JCB service manual (Section E).
JCB 3CX / 4CX 07/10/2026 18
JCB 3CX / 4CX Hydraulics: Circuit Diagrams, Pumps and Relief Valve Pressures
Section E of the JCB service manual (publication 9803/3290-14) deals with the hydraulic system of the JCB 3C, 3CX and 4CX backhoe loaders. It brings together technical data for the pumps and valve blocks, hydraulic circuits for machines of different build years, valve operation, fault finding tables, and the procedures for pressure testing and for overhauling the pump, valves and rams. The section PDF runs to 302 pages.
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