Sprinter Maintenance: One-man Brake Fluid Flush

The MB Sprinter owner's manual suggests changing the brake fluid every two years. The brake fluid flush is easier than you think with the right tool.

Parts purchased from Amazon

Orion Motor Tech Brake Pressure Bleeder, European Brake Bleeder with Hand Pump, 2.5L Pressure Brake Bleeder with Hose and European Adapter

Genuine Mercedes DOT 4+ Brake Fluid (Needs 2 quarts)

Roadtrek Sprinter Eclipse Head Unit Upgrade to 10-inch QLED screen Atoto S8 Premium (2nd Gen)

Our 11-year-old Eclipse AVN4430 head unit with TomTom navigation maps is now woefully outdated. I won't miss its small, difficult-to-read screen or any of the other quirks that came with it. Enter the Atoto Android head units, which are rapidly gaining popularity. Their premium, ultra, and ultra plus models boast a QLED display that remains easily readable even in bright sunlight. Opting for the larger 10-inch Atoto S8 Premium model was a no-brainer for me, especially considering its affordability compared to other high-end units with similar specs.

Installing an On-Board Air Compressor (Maxi Trac)

Finding the right RV compressor can be challenging, especially if you want one that can inflate RV tires to a high pressure. Many RVers highly recommend the Viair RV compressor. Off-roaders and overlanders choose the ARB CKMTA12 On-Board Twin High Performance Air Compressor because it is a quick and dependable inflator, but it is pricey.

I'm looking for a low-cost, high-output, high-pressure compressor capable of quickly inflating RV tires, air mattresses, and inflatable toys (kayaks, SUPs, and so on). Our 120-volt portable compressor inflates one SUP in about 20 minutes, which is excruciatingly slow. The Napa Maxi-Trac air inflator is getting a lot of buzz in the DIY community, so I took the plunge and ordered one. With a 20% OFF coupon, it cost me slightly more than $100.

Renogy DC-to-DC Battery Charger Installation

The Renogy 40-Amp DC-to-DC battery charger had been on my Amazon wishlist for a while, and it was on sale during the holidays, so I bought one. I was planning on getting it anyway for our upcoming Lithium battery upgrade (coming soon). A DC-to-DC charger is required to limit the current draw from the alternator, particularly with Lithium batteries, which can draw a large amount of current from the alternator while charging.

According to Mercedes Body and Equipment Guidelines for 2018 Sprinter and older, it states that the maximum charging current for the auxiliary batteries should not exceed 40-Amps. For now, our current AGM coach batteries will benefit from the DC-to-DC charger as it will receive a proper 3-stage charging (bulk, absorb, float) while driving or idling. 

Motorized City Fresh Water Tank Fill Valve with Automatic Fresh Water Pump Control

Like many Roadtrek RV models, the RT Agile has two options in getting their fresh water tank filled, either via gravity fill port located on passenger side door B-pillar or via the city water hookup. I mostly use the city water connection just because it is on the same side where the macerator dump is, and most dump stations/ campgrounds are set up this way. 

Filling the fresh water tank via city water hookup involves few steps and this mod drastically shortens those steps. To fill the fresh water tank, all I have to do now is flip a switch then hookup the city water…and that’s it. No more walking around the RV, opening the sliding door, reaching and manually opening the fill valve, then doing same process in reverse once the tank gets full.