Last time with Mazda i used Hella UP28, SC-VP-Hella-UP28-Vacuum-Pump-Technical-Information auxilliary vacuum pump a lot of cars use to assisst with brake servo. It was not meant to be in permanent operation, it needs a vacuum switch and check valve. Also Peugeot 406 has larger brake cylinder bellows that pump must evacuate.
I decided to get a larger Hella UP30 vacuum pump. It is fully capable to assist Pug cylinder and provides powered braking 3 times before evacuating.
For vacuum switch i selected Dracarys vacuum switch.
Check valve is already present inside booster bellows.
I used 30A relay to trigger pump operation according to this schematic.
I made a small mount so pump is suspended on its rubber mounts. I decided to mount it inside the central tunnel for easy acces in case replacement would be neccessary. It is after all a part of a critical system.
Because i installed 3kW charger inside the tunnel and there are HV cables running front to back i decided it would be best to move the UP30 pump nearer to the brake cylinder. I installed it on the transverse member of battery box mount.
To the system i added one check valve. It fights the outside pressure and keeps the “vacuum in”. I tried different check valves and i decided that here are the best/easiest to use variants. I use 10mm hose that fits directly to the cylinder bellows.
After some shuffling of cables and tubes i decided to relocate vacuum switch next to the ABS pump. That gains me less vacuum hose twist. and direct path without additional loops.
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