liliankrueger57

Modus brake fluid loss

Hey, I'm having a weird issue with my 2005 Renault Modus (gasoline engine). The brake fluid level keeps dropping, and the brake pedal feels spongy, like it's not fully engaging sometimes. It's done 175526 km. I checked for obvious leaks around the wheels and under the master cylinder, but nothing! Could it be the pads? Or something more serious with the brake system itself? It's stressing me out!

A 2005 Renault Modus owner experienced a persistent drop in brake fluid levels and a spongy brake pedal, despite finding no visible leaks. The issue could stem from worn brake pads or internal leaks in the rear brake cylinders. Checking for dampness around the rear cylinders and assessing the thickness of the brake pads were suggested steps. Ultimately, a mechanic confirmed that worn rear brakes were the cause, leading to their replacement and resolving the problem.

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4 comment(s)

I had a similar problem with my Modus! The spongy pedal feel is really unsettling, isn't it? When the brake fluid is low, air can get into the hydraulic brakes, which are powered by fluid pressure, causing that feeling. Have you checked the rear brake cylinders? They can sometimes leak internally without it being obvious. Also, how worn are your brake pads and discs? Severely worn brakes can cause the fluid level to drop as the caliper piston extends further to compensate.

Thanks for the quick reply! I did have a quick look at the rear cylinders, but maybe I need to take a closer look. What exactly should I be looking for? And how would I know if it's definitely the pads causing the issue?

Okay, so with the rear cylinders, look for any signs of dampness or fluid around the seals. It might be subtle, a slight discoloration even. As for the pads, if they're really thin, like less than 3mm, that's a good indication. Honestly, though, with brake issues, it's often best to get a professional opinion. The whole brake system, including the master cylinder and the brake lines, is pretty crucial for safety.

Thanks a million for the advice! I took it to a mechanic, and you were spot on – the rear brakes were worn causing low brake fluid. Turns out they needed replacing. Cost me 480€, but at least I've got piece of mind now!

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RENAULT

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MODUS