This Merida Matts 40 had the OEM Promax Dechipher hydraulic brakes, but they were sticking, noisy and rubbing – with an owner not wanting to use the bike.
They felt as if they had been overfilled and an investigation showed that there was a lot of fluid in the system. But after adjustment the pistons still weren’t behaving.
At this level it is just not cost efficient to investigate further as both Shimano and Avid systems are available at reasonable prices.
Shimano M355 brakes were fitted to complement the Altus gears, leaving a bicycle that is usable once again (and despite the heavy rain a hopefully happy cyclist).