What does Sandvik fault code 502-131 (Brake Pressure) mean?

Q: What does Sandvik fault code 502-131 (Brake Pressure) mean?

502-131 (Brake Pressure) indicates: Service brakes feel "spongy" or don't hold; Alarm sounds; Machine may be locked in neutral. Fix: Brake Accumulator Pressure Low. LOGIC: The pressure switch or transducer detects that the accumulator pressure has dropped below the safety limit (usually 110-120 bar). ACTION: 1. Check brake oil level. 2. Inspect the accumulator charging valve. 3. Check for internal leaks in the brake piston seals. FIX: Recharge the nitrogen in the accumulator or replace the brake charging pump.

Sandvik Fault Code

Free · no signup

502-131 (Brake Pressure)

Service brakes feel "spongy" or don't hold; Alarm sounds; Machine may be locked in neutral.

System

Not specified

Symptom

Service brakes feel "spongy" or don't hold; Alarm sounds; Machine may be locked in neutral.

Diagnosis & fix steps

Brake Accumulator Pressure Low. LOGIC: The pressure switch or transducer detects that the accumulator pressure has dropped below the safety limit (usually 110-120 bar). ACTION: 1. Check brake oil level. 2. Inspect the accumulator charging valve. 3. Check for internal leaks in the brake piston seals. FIX: Recharge the nitrogen in the accumulator or replace the brake charging pump.

Red Seal field insights

In mining, brake safety is #1. If the nitrogen pre-charge in the accumulator is gone, the pump will "cycle" constantly (clunking sound every few seconds). This will eventually burn out the pump if not recharged.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

This is general reference information, not a repair manual. It is for trained, qualified technicians.
Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

Track this across your whole fleet

This code is free to read. AM Fleet Integrity lets your team log fault codes against assets, plus the full fault-code library, QR operator reporting, PM scheduling and predictive alerts. Start free — no credit card required.

Start your free trial

Related Sandvik fault codes

← All Sandvik fault codes