Axle Modulator 1B / Implausible Pressure Control (Circuit B) / Pressure Too High
â–¶ How to fix
- Check right spring brake chamber at the axle for internal leakage (check not necessary for normal brake chambers) - Replace the axle-modulator
What you'll see
Warning on dashboard / Vehicle behaviour might be changed
System reaction
- ABS partly or completely switched off - ESC-function switched off - el.pn. pressurecontrol is switched off at relevant axle(s)
Diagnostic depth
Detection
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Possible cause
- Right spring brake chamber is leaky - Faulty axle-modulator